The text of this chapter is extracted from the 2023 edition of the Florida Building Code, Fuel Gas and has been modified where necessary to conform to the scope of application of the Florida Building Code, Residential. The section numbers appearing in parentheses after each section number are the section numbers of the corresponding text in the Florida Building Code, Fuel Gas.
This chapter covers those fuel gas piping systems, fuel-gas appliances and related accessories, venting systems and combustion air configurations most commonly encountered in the construction of one- and two-family dwellings and structures regulated by this code.
Coverage of piping systems shall extend from the point of delivery to the outlet of the appliance shutoff valves (see definition of "Point of delivery"). Piping systems requirements shall include design, materials, components, fabrication, assembly, installation, testing, inspection, operation and maintenance. Requirements for gas appliances and related accessories shall include installation, combustion and ventilation air and venting and connections to piping systems.
The omission from this chapter of any material or method of installation provided for in the Florida Building Code, Fuel Gas shall not be construed as prohibiting the use of such material or method of installation. Fuel-gas piping systems, fuel-gas appliances and related accessories, venting systems and combustion air configurations not specifically covered in these chapters shall comply with the applicable provisions of the Florida Building Code, Fuel Gas.
Gaseous hydrogen systems shall be regulated by Chapter 7 of the Florida Building Code, Fuel Gas.
This chapter shall not apply to the following:
- Liquefied natural gas (LNG) installations.
- Temporary LP-gas piping for buildings under construction or renovation that is not to become part of the permanent piping system.
- Except as provided in Section G2412.1.1, gas piping, meters, gas pressure regulators, and other appurtenances used by the serving gas supplier in the distribution of gas, other than undiluted LP-gas.
- Portable LP-gas appliances and equipment of all types that is not connected to a fixed fuel piping system.
- Portable fuel cell appliances that are neither connected to a fixed piping system nor interconnected to a power grid.
- Installation of hydrogen gas, LP-gas and compressed natural gas (CNG) systems on vehicles.
Unless otherwise expressly stated, the following words and terms shall, for the purposes of this chapter, have the meanings indicated in this chapter.
Words used in the present tense include the future; words in the masculine gender include the feminine and neuter; the singular number includes the plural and the plural, the singular.
Where terms are not defined in this code and are defined in the Florida Building Code, Building; Florida Fire Prevention Code; Florida Building Code, Mechanical; Florida Building Code, Fuel Gas; or Florida Building Code, Plumbing such terms shall have meanings ascribed to them as in those codes.
ACCESS (TO). That which enables a device, appliance or equipment to be reached by ready access or by a means that first requires the removal or movement of a panel, door or similar obstruction (see also "Ready access").
AIR, EXHAUST. Air being removed from any space or piece of equipment or appliance and conveyed directly to the atmosphere by means of openings or ducts.
AIR, MAKEUP. Any combination of outdoor and transfer air intended to replace exhaust air and exfiltration.
AIR CONDITIONER, GAS-FIRED. A gas-burning, automatically operated appliance for supplying cooled air, dehumidified air, or both, or chilled liquid.
AIR CONDITIONING. The treatment of air so as to control simultaneously the temperature, humidity, cleanness and distribution of the air to meet the requirements of a conditioned space.
AIR-HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area.
ALTERATION. A change in a system that involves an extension, addition or change to the arrangement, type or purpose of the original installation.
ANODELESS RISER. A transition assembly in which plastic piping is installed and terminated above ground outside of a building.
APPLIANCE. Any apparatus or device that utilizes a fuel or a raw material as a fuel to produce light, heat, power, refrigeration or air conditioning. Also, an apparatus that compresses fuel gases.
APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic burner ignition and safety shut-off device and other automatic devices, that accomplish complete turn-on and shut-off of the gas to the main burner or burners, and graduate the gas supply to the burner or burners, but do not affect complete shut-off of the gas.
APPLIANCE, FAN-ASSISTED COMBUSTION. An appliance equipped with an integral mechanical means to either draw or force products of combustion through the combustion chamber or heat exchanger.
APPLIANCE, UNVENTED. An appliance designed or installed in such a manner that the products of combustion are not conveyed by a vent or chimney directly to the outside atmosphere.
APPLIANCE, VENTED. An appliance designed and installed in such a manner that all of the products of combustion are conveyed directly from the appliance to the outside atmosphere through an approved chimney or vent system.
APPROVED. Acceptable to the code official.
APPROVED AGENCY. An established and recognized agency that is regularly engaged in conducting tests, furnishing inspection services or furnishing certification, where such agency has been approved by the code official.
ATMOSPHERIC PRESSURE. The pressure of the weight of air and water vapor on the surface of the earth, approximately 14.7 pounds per square inch (psia) (101 kPa absolute) at sea level.
AUTOMATIC IGNITION. Ignition of gas at the burner(s) when the gas controlling device is turned on, including reignition if the flames on the burner(s) have been extinguished by means other than by the closing of the gas controlling device.
BAROMETRIC DRAFT REGULATOR. A balanced damper device attached to a chimney, vent connector, breeching or flue gas manifold to protect combustion appliances by controlling chimney draft. A double-acting barometric draft regulator is one whose balancing damper is free to move in either direction to protect combustion appliances from both excessive draft and backdraft.
Hot water heating boiler. A boiler in which no steam is generated, from which hot water is circulated for heating purposes and then returned to the boiler, and that operates at water pressures not exceeding 160 pounds per square inch gauge (psig) (1100 kPa gauge) and at water temperatures not exceeding 250°F (121°C) at or near the boiler outlet.
Hot water supply boiler. A boiler, completely filled with water, which furnishes hot water to be used externally to itself, and that operates at water pressures not exceeding 160 psig (1100 kPa gauge) and at water temperatures not exceeding 250°F (121°C) at or near the boiler outlet.
Steam heating boiler. A boiler in which steam is generated and that operates at a steam pressure not exceeding 15 psig (100 kPa gauge).
BONDING JUMPER. A conductor installed to electrically connect metallic gas piping to the grounding electrode system.
BRAZING. A metal-joining process wherein coalescence is produced by the use of a nonferrous filler metal having a melting point above 1,000°F (538°C), but lower than that of the base metal being joined. The filler material is distributed between the closely fitted surfaces of the joint by capillary action.
BTU. Abbreviation for British thermal unit, which is the quantity of heat required to raise the temperature of 1 pound (454 g) of water 1°F (0.56°C) (1 Btu = 1055 J).
BURNER. A device for the final conveyance of the gas, or a mixture of gas and air, to the combustion zone.
Induced-draft. A burner that depends on draft induced by a fan that is an integral part of the appliance and is located downstream from the burner.
Power. A burner in which gas, air or both are supplied at pressures exceeding, for gas, the line pressure, and for air, atmospheric pressure, with this added pressure being applied at the burner.
CHIMNEY. A primarily vertical structure containing one or more flues, for the purpose of carrying gaseous products of combustion and air from an appliance to the outside atmosphere.
Factory-built chimney. A listed and labeled chimney composed of factory-made components, assembled in the field in accordance with manufacturer's instructions and the conditions of the listing.
Masonry chimney. A field-constructed chimney composed of solid masonry units, bricks, stones or concrete.
CLEARANCE. The minimum distance through air measured between the heat-producing surface of the mechanical appliance, device or equipment and the surface of the combustible material or assembly.
Type 1. Factory-built package, multiple production. Primarily used in the family living environment. Usually the smallest unit physically and in function output.
CODE. These regulations, subsequent amendments thereto, or any emergency rule or regulation that the administrative authority having jurisdiction has lawfully adopted.
CODE OFFICIAL. The officer or other designated authority charged with the administration and enforcement of this code, or a duly authorized representative.
COMBUSTIBLE ASSEMBLY. Wall, floor, ceiling or other assembly constructed of one or more component materials that are not defined as noncombustible.
COMBUSTIBLE MATERIAL. Any material not defined as noncombustible.
COMBUSTION. In the context of this code, refers to the rapid oxidation of fuel accompanied by the production of heat or heat and light.
COMBUSTION AIR. Air necessary for complete combustion of a fuel, including theoretical air and excess air.
COMBUSTION PRODUCTS. Constituents resulting from the combustion of a fuel with the oxygen of the air, including the inert gases, but excluding excess air.
CONCEALED LOCATION. A location that cannot be accessed without damaging permanent parts of the building structure or finish surface. Spaces above, below or behind readily removable panels or doors shall not be considered as concealed.
CONDENSATE. The liquid that condenses from a gas (including flue gas) caused by a reduction in temperature or increase in pressure.
CONNECTOR, APPLIANCE (Fuel). Rigid metallic pipe and fittings, semirigid metallic tubing and fittings or a listed and labeled device that connects an appliance to the gas piping system.
CONTROL. A manual or automatic device designed to regulate the gas, air, water or electrical supply to, or operation of, a mechanical system.
CONVERSION BURNER. A unit consisting of a burner and its controls for installation in an appliance originally utilizing another fuel.
COPPER ALLOY. A homogeneous mixture of not less than two metals where not less than 50 percent of the finished metal is copper.
CUBIC FOOT. The amount of gas that occupies 1 cubic foot (0.02832 m3) when at a temperature of 60°F (16°C), saturated with water vapor and under a pressure equivalent to that of 30 inches of mercury (101 kPa).
DAMPER. A manually or automatically controlled device to regulate draft or the rate of flow of air or combustion gases.
DECORATIVE APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames.
DECORATIVE APPLIANCES FOR INSTALLATION IN VENTED FIREPLACES. A vented appliance designed for installation within the fire chamber of a vented fireplace, wherein the primary function lies in the aesthetic effect of the flames.
DEMAND. The maximum amount of gas input required per unit of time, usually expressed in cubic feet per hour, or Btu/h (1 Btu/h = 0.2931 W).
DESIGN FLOOD ELEVATION. The elevation of the "design flood," including wave height, relative to the datum specified on the community's legally designated flood hazard map. In areas designated as Zone AO, the design flood elevation shall be the elevation of the highest existing grade of the building's perimeter plus the depth number (in feet) specified on the flood hazard map. In areas designated as Zone AO where a depth number is not specified on the map, the depth number shall be taken as being equal to 2 feet (610 mm).
DIRECT-VENT APPLIANCES. Appliances that are constructed and installed so that all air for combustion is derived directly from the outside atmosphere and all flue gases are discharged directly to the outside atmosphere.
DRAFT. The pressure difference existing between the appliance or any component part and the atmosphere, that causes a continuous flow of air and products of combustion through the gas passages of the appliance to the atmosphere.
Mechanical or induced draft. The pressure difference created by the action of a fan, blower or ejector that is located between the appliance and the chimney or vent termination.
Natural draft. The pressure difference created by a vent or chimney because of its height, and the temperature difference between the flue gases and the atmosphere.
DRAFT HOOD. A nonadjustable device built into an appliance, or made as part of the vent connector from an appliance, that is designed to: provide for ready escape of the flue gases from the appliance in the event of no draft, backdraft, or stoppage beyond the draft hood; prevent a backdraft from entering the appliance; and neutralize the effect of stack action of the chimney or gas vent upon operation of the appliance.
DRAFT REGULATOR. A device that functions to maintain a desired draft in the appliance by automatically reducing the draft to the desired value.
DRIP. The container placed at a low point in a system of piping to collect condensate and from which the condensate is removable.
DUCT FURNACE. A warm-air furnace normally installed in an air distribution duct to supply warm air for heating. This definition shall apply only to a warm-air heating appliance that depends for air circulation on a blower not furnished as part of the furnace.
DWELLING UNIT. A single unit providing complete, independent living facilities for one or more persons, including permanent provisions for living, sleeping, eating, cooking and sanitation.
EQUIPMENT. Apparatus and devices other than appliances.
EXCESS FLOW VALVE (EFV). A valve designed to activate when the fuel gas passing through it exceeds a prescribed flow rate.
EXTERIOR MASONRY CHIMNEYS. Masonry chimneys exposed to the outdoors on one or more sides below the roof line.
FIREPLACE. A fire chamber and hearth constructed of noncombustible material for use with solid fuels and provided with a chimney.
Factory-built fireplace. A fireplace composed of listed factory-built components assembled in accordance with the terms of listing to form the completed fireplace.
Masonry fireplace. A hearth and fire chamber of solid masonry units such as bricks, stones, listed masonry units or reinforced concrete, provided with a suitable chimney.
FLAME SAFEGUARD. A device that will automatically shut off the fuel supply to a main burner or group of burners when the means of ignition of such burners becomes inoperative, and when flame failure occurs on the burner or group of burners.
FLASHBACK ARRESTOR CHECK VALVE. A device that will prevent the backflow of one gas into the supply system of another gas and prevent the passage of flame into the gas supply system.
FLOOD HAZARD AREA. The greater of the following two areas:
- The area within a floodplain subject to a 1 percent or greater chance of flooding in any given year.
- This area designated as a flood hazard area on a community's flood hazard map, or otherwise legally designated.
FLOOR FURNACE. A completely self-contained furnace suspended from the floor of the space being heated, taking air for combustion from outside such space and with means for observing flames and lighting the appliance from such space.
FLUE, APPLIANCE. The passage(s) within an appliance through which combustion products pass from the combustion chamber of the appliance to the draft hood inlet opening on an appliance equipped with a draft hood or to the outlet of the appliance on an appliance not equipped with a draft hood.
FLUE COLLAR. That portion of an appliance designed for the attachment of a draft hood, vent connector or venting system.
FLUE LINER (LINING). A system or material used to form the inside surface of a flue in a chimney or vent, for the purpose of protecting the surrounding structure from the effects of combustion products and for conveying combustion products without leakage to the atmosphere.
FUEL GAS. A natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases.
FURNACE. A completely self-contained heating unit that is designed to supply heated air to spaces remote from or adjacent to the appliance location.
FURNACE, CENTRAL. A self-contained appliance for heating air by transfer of heat of combustion through metal to the air, and designed to supply heated air through ducts to spaces remote from or adjacent to the appliance location.
FURNACE PLENUM. An air compartment or chamber to which one or more ducts are connected and that forms part of an air distribution system.
GAS CONVENIENCE OUTLET. A permanently mounted, manually operated device that provides the means for connecting an appliance to, and disconnecting an appliance from, the supply piping. The device includes an integral, manually operated valve with a nondisplaceable valve member and is designed so that disconnection of an appliance only occurs when the manually operated valve is in the closed position.
GAS PIPING. An installation of pipe, valves or fittings installed on a premises or in a building and utilized to convey fuel gas.
HAZARDOUS LOCATION. Any location considered to be a fire hazard for flammable vapors, dust, combustible fibers or other highly combustible substances. The location is not necessarily categorized in the Florida Building Code, Building. as a high-hazard use group classification.
HOUSE PIPING. See "Piping system."
IGNITION PILOT. A pilot that operates during the lighting cycle and discontinues during main burner operation.
IGNITION SOURCE. A flame spark or hot surface capable of igniting flammable vapors or fumes. Such sources include appliance burners, burner ignitors and electrical switching devices.
INFRARED RADIANT HEATER. A heater that directs a substantial amount of its energy output in the form of infrared radiant energy into the area to be heated. Such heaters are of either the vented or unvented type.
JOINT, FLARED. A metal-to-metal compression joint in which a conical spread is made on the end of a tube that is compressed by a flare nut against a mating flare.
JOINT, MECHANICAL. A general form of gas-tight joints obtained by the joining of metal parts through a positive-holding mechanical construction, such as a press-connect joint, flanged joint, threaded joint, flared joint or compression joint.
JOINT, PLASTIC ADHESIVE. A joint made in thermoset plastic piping by the use of an adhesive substance that forms a continuous bond between the mating surfaces without dissolving either one of them.
LABELED. Equipment, materials or products to which have been affixed a label, seal, symbol or other identifying mark of a nationally recognized testing laboratory, inspection agency or other organization concerned with product evaluation that maintains periodic inspection of the production of the above-labeled items and whose labeling indicates either that the equipment, material or product meets identified standards or has been tested and found suitable for a specified purpose.
LEAK CHECK. An operation performed on a gas piping system to verify that the system does not leak.
LIQUEFIED PETROLEUM GAS or LPG (LP-GAS). Liquefied petroleum gas composed predominately of propane, propylene, butanes or butylenes, or mixtures thereof that is gaseous under normal atmospheric conditions, but is capable of being liquefied under moderate pressure at normal temperatures.
LISTED. Equipment, materials, products or services included in a list published by an organization acceptable to the code official and concerned with evaluation of products or services that maintains periodic inspection of production of listed equipment or materials or periodic evaluation of services and whose listing states either that the equipment, material, product or service meets identified standards or has been tested and found suitable for a specified purpose.
LIVING SPACE. Space within a dwelling unit utilized for living, sleeping, eating, cooking, bathing, washing and sanitation purposes.
LOG LIGHTER. A manually operated solid-fuel ignition appliance for installation in a vented solid fuel-burning fireplace.
MAIN BURNER. A device or group of devices essentially forming an integral unit for the final conveyance of gas or a mixture of gas and air to the combustion zone, and on which combustion takes place to accomplish the function for which the appliance is designed.
METER. The instrument installed to measure the volume of gas delivered through it.
MODULATING. Modulating or throttling is the action of a control from its maximum to minimum position in either predetermined steps or increments of movement as caused by its actuating medium.
NONCOMBUSTIBLE MATERIALS. Materials that, where tested in accordance with ASTM E136, have not fewer than three of four specimens tested meeting all of the following criteria:
- The recorded temperature of the surface and interior thermocouples shall not at any time during the test rise more than 54°F (30°C) above the furnace temperature at the beginning of the test.
- There shall not be flaming from the specimen after the first 30 seconds.
- If the weight loss of the specimen during testing exceeds 50 percent, the recorded temperature of the surface and interior thermocouples shall not at any time during the test rise above the furnace air temperature at the beginning of the test, and there shall not be flaming of the specimen.
OFFSET (VENT). A combination of approved bends that make two changes in direction bringing one section of the vent out of line, but into a line parallel with the other section.
OXYGEN DEPLETION SAFETY SHUTOFF SYSTEM (ODS). A system designed to act to shut off the gas supply to the main and pilot burners if the oxygen in the surrounding atmosphere is reduced below a predetermined level.
Pipe. A rigid conduit of iron, steel, copper, copper-alloy or plastic.
Tubing. Semirigid conduit of copper, copper-alloy, aluminum, plastic or steel.
PIPING SYSTEM. The fuel piping, valves and fittings from the outlet of the point of delivery to the outlets of the appliance shutoff valves.
PLASTIC, THERMOPLASTIC. A plastic that is capable of being repeatedly softened by increase of temperature and hardened by decrease of temperature.
POINT OF DELIVERY. For natural gas systems, the point of delivery is the outlet of the service meter assembly or the outlet of the service regulator or service shutoff valve where a meter is not provided. Where a system shutoff valve is provided after the outlet of the service meter assembly, such valve shall be considered to be downstream of the point of delivery. For undiluted liquefied petroleum gas systems, the point of delivery shall be considered to be the outlet of the service pressure regulator, exclusive of line gas regulators, in the system.
PRESS-CONNECT JOINT. A permanent mechanical joint incorporating an elastomeric seal or an elastomeric seal and corrosion-resistant grip or bite ring. The joint is made with a pressing tool and jaw or ring approved by the fitting manufacturer.
PRESSURE DROP. The loss in pressure due to friction or obstruction in pipes, valves, fittings, regulators and burners.
PRESSURE TEST. An operation performed to verify the gas tight integrity of gas piping following its installation or modification.
READY ACCESS (TO). That which enables a device, appliance or equipment to be directly reached, without requiring the removal or movement of any panel, door or similar obstruction. (See "Access.")
REGULATOR. A device for controlling and maintaining a uniform gas supply pressure, either pounds-to-inches water column (MP regulator) or inches-to-inches water column (appliance regulator).
REGULATOR, GAS APPLIANCE. A pressure regulator for controlling pressure to the manifold of the gas appliance.
REGULATOR, LINE GAS PRESSURE. A device placed in a gas line between the service pressure regulator and the appliance for controlling, maintaining or reducing the pressure in that portion of the piping system downstream of the device.
REGULATOR, MEDIUM-PRESSURE (MP Regulator). A line pressure regulator that reduces gas pressure from the range of greater than 0.5 psig (3.4 kPa) and less than or equal to 5 psig (34.5 kPa) to a lower pressure.
REGULATOR, MONITORING. A pressure regulator set in series with another pressure regulator for the purpose of preventing an overpressure in the downstream piping system.
REGULATOR, PRESSURE. A device placed in a gas line for reducing, controlling and maintaining the pressure in that portion of the piping system downstream of the device.
REGULATOR, SERVICE PRESSURE. For natural gas systems, a device installed by the serving gas supplier to reduce and limit the service line pressure to delivery pressure. For undiluted liquefied petroleum gas systems, the regulator located upstream from all line gas pressure regulators, where installed, and downstream from any first stage or a high pressure regulator in the system.
RELIEF OPENING. The opening provided in a draft hood to permit the ready escape to the atmosphere of the flue products from the draft hood in the event of no draft, backdraft or stoppage beyond the draft hood, and to permit air into the draft hood in the event of a strong chimney updraft.
RELIEF VALVE (DEVICE). A safety valve designed to forestall the development of a dangerous condition by relieving either pressure, temperature or vacuum in the hot water supply system.
RELIEF VALVE, PRESSURE. An automatic valve that opens and closes a relief vent, depending on whether the pressure is above or below a predetermined value.
Manual reset type. A valve that automatically opens a relief vent at a predetermined temperature and that must be manually returned to the closed position.
Reseating or self-closing type. An automatic valve that opens and closes a relief vent, depending on whether the temperature is above or below a predetermined value.
RELIEF VALVE, VACUUM. A valve that automatically opens and closes a vent for relieving a vacuum within the hot water supply system, depending on whether the vacuum is above or below a predetermined value.
ROOM HEATER, UNVENTED. See "Unvented room heater."
ROOM HEATER, VENTED. A free-standing heating unit used for direct heating of the space in and adjacent to that in which the unit is located. (See "Vented room heater.")
SAFETY SHUTOFF DEVICE. See "Flame safeguard."
SERVICE METER ASSEMBLY. The meter, valve, regulator, piping, fittings and equipment installed by the service gas supplier before the point of delivery.
SHAFT. An enclosed space extending through one or more stories of a building, connecting vertical openings in successive floors, or floors and the roof.
SPECIFIC GRAVITY. As applied to gas, specific gravity is the ratio of the weight of a given volume to that of the same volume of air, both measured under the same condition.
THERMOSTAT. (See types that follow.)
Electric switch type. A device that senses changes in temperature and controls electrically, by means of separate components, the flow of gas to the burner(s) to maintain selected temperatures.
Integral gas valve type. An automatic device, actuated by temperature changes, designed to control the gas supply to the burner(s) in order to maintain temperatures between predetermined limits, and in which the thermal actuating element is an integral part of the device.
- Graduating thermostat. A thermostat in which the motion of the valve is approximately in direct proportion to the effective motion of the thermal element induced by temperature change.
- Snap-acting thermostat. A thermostat in which the thermostatic valve travels instantly from the closed to the open position, and vice versa.
THIRD-PARTY CERTIFICATION AGENCY. An approved agency operating a product or material certification system that incorporates initial product testing, assessment and surveillance of a manufacturer's quality control system.
THIRD-PARTY CERTIFIED. Certification obtained by the manufacturer indicating that the function and performance characteristics of a product or material have been determined by testing and ongoing surveillance by an approved third-party certification agency. Assertion of certification is in the form of identification in accordance with the requirements of the third-party certification agency.
THIRD-PARTY TESTED. Procedure by which an approved testing laboratory provides documentation that a product, material or system conforms to specified requirements.
TOILET, GAS-FIRED. A packaged and completely assembled appliance containing a toilet that incinerates refuse instead of flushing it away with water.
TRANSITION FITTINGS, PLASTIC TO STEEL. An adapter for joining plastic pipe to steel pipe. The purpose of this fitting is to provide a permanent, pressure-tight connection between two materials that cannot be joined directly one to another.
UNIT HEATER. A self-contained, automatically controlled, vented, fuel-gas-burning, space-heating appliance, intended for installation in the space to be heated without the use of ducts, and having integral means for circulation of air.
UNVENTED ROOM HEATER. An unvented heating appliance designed for stationary installation and utilized to provide comfort heating. Such appliances provide radiant heat or convection heat by gravity or fan circulation directly from the heater and do not utilize ducts.
VALVE. A device used in piping to control the gas supply to any section of a system of piping or to an appliance.
Appliance shutoff. A valve located in the piping system, used to isolate individual appliances for purposes such as service or replacement.
Automatic. An automatic or semiautomatic device consisting essentially of a valve and an operator that control the gas supply to the burner(s) during operation of an appliance. The operator shall be actuated by application of gas pressure on a flexible diaphragm, by electrical means, by mechanical means or by other approved means.
Automatic gas shutoff. A valve used in conjunction with an automatic gas shutoff device to shut off the gas supply to a water-heating system. It shall be constructed integrally with the gas shutoff device or shall be a separate assembly.
Manual main gas-control. A manually operated valve in the gas line for the purpose of completely turning on or shutting off the gas supply to the appliance, except to pilot or pilots that are provided with independent shutoff.
Manual reset. An automatic shutoff valve installed in the gas supply piping and set to shut off when unsafe conditions occur. The device remains closed until manually reopened.
Service shutoff. A valve, installed by the serving gas supplier between the source of supply and the point of delivery, to shut off the entire piping system.
VENT. A pipe or other conduit composed of factory-made components, containing a passageway for conveying combustion products and air to the atmosphere, listed and labeled for use with a specific type or class of appliance.
Special gas vent. A vent listed and labeled for use with listed Category II, III and IV gas appliances.
Type B vent. A vent listed and labeled for use with appliances with draft hoods and other Category I appliances that are listed for use with Type B vents.
Type L vent. A vent listed and labeled for use with appliances that are listed for use with Type L or Type B vents.
Breather. Piping run from a pressure-regulating device to the outdoors, designed to provide a reference to atmospheric pressure. If the device incorporates an integral pressure relief mechanism, a breather vent can also serve as a relief vent.
Relief. Piping run from a pressure-regulating or pressure-limiting device to the outdoors, designed to provide for the safe venting of gas in the event of excessive pressure in the gas piping system.
VENTED APPLIANCE CATEGORIES. Appliances that are categorized for the purpose of vent selection are classified into the following four categories:
Category I. An appliance that operates with a nonpositive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent.
Category II. An appliance that operates with a nonpositive vent static pressure and with a vent gas temperature that is capable of causing excessive condensate production in the vent.
Category III. An appliance that operates with a positive vent static pressure and with a vent gas temperature that avoids excessive condensate production in the vent.
Category IV. An appliance that operates with a positive vent static pressure and with a vent gas temperature that is capable of causing excessive condensate production in the vent.
VENTED ROOM HEATER. A vented self-contained, free-standing, nonrecessed appliance for furnishing warm air to the space in which it is installed, directly from the heater without duct connections.
VENTED WALL FURNACE. A self-contained vented appliance complete with grilles or equivalent, designed for incorporation in or permanent attachment to the structure of a building, mobile home or travel trailer, and furnishing heated air circulated by gravity or by a fan directly into the space to be heated through openings in the casing. This definition shall exclude floor furnaces, unit heaters and central furnaces as herein defined.
VENTING SYSTEM. A continuous open passageway from the flue collar or draft hood of an appliance to the outdoor atmosphere for the purpose of removing flue or vent gases. A venting system is usually composed of a vent or a chimney and vent connector, if used, assembled to form the open passageway.
WALL HEATER, UNVENTED TYPE. A room heater of the type designed for insertion in or attachment to a wall or partition. Such heater does not incorporate concealed venting arrangements in its construction and discharges all products of combustion through the front into the room being heated.
WATER HEATER. Any heating appliance or equipment that heats potable water and supplies such water to the potable hot water distribution system.
This section shall govern the approval and installation of all equipment and appliances that comprise parts of the installations regulated by this code in accordance with Section G2401.
The requirements for combustion and dilution air for gas-fired appliances shall be governed by Section G2407. The requirements for combustion and dilution air for appliances operating with fuels other than fuel gas shall be regulated by Chapter 17.
Appliances regulated by this code shall be listed and labeled for the application in which they are used unless otherwise approved in accordance with Section 104.11 of the Florida Building Code, Building. The approval of unlisted appliances in accordance with Section 104.11 of the Florida Building Code, Building shall be based on approved engineering evaluation.
Defective material or parts shall be replaced or repaired in such a manner so as to preserve the original approval or listing.
Appliances and supports that are exposed to wind shall be designed and installed to resist the wind pressures determined in accordance with this code.
For structures located in flood hazard areas, the appliance, equipment and system installations regulated by this code shall be located at or above the elevation required by Section R322 for utilities and attendant equipment.
Exception: The appliance, equipment and system installations regulated by this code are permitted to be located below the elevation required by Section R322 for utilities and attendant equipment provided that they are designed and installed to prevent water from entering or accumulating within the components and to resist hydrostatic and hydrodynamic loads and stresses, including the effects of buoyancy, during the occurrence of flooding to such elevation.
UpCodes Diagrams (4)
Reserved.
Buildings or structures and the walls enclosing habitable or occupiable rooms and spaces in which persons live, sleep or work, or in which feed, food or foodstuffs are stored, prepared, processed, served or sold, shall be constructed to protect against the entry of rodents.
Category IV condensing appliances shall be provided with an auxiliary drain pan where damage to any building component will occur as a result of stoppage in the condensate drainage system. Such pan shall be installed in accordance with the applicable provisions of Section M1411.
Exception: An auxiliary drain pan shall not be required for appliances that automatically shut down operation in the event of a stoppage in the condensate drainage system.
UpCodes Diagram (1)
Condensate pumps located in uninhabitable spaces, such as attics and crawl spaces, shall be connected to the appliance or equipment served such that when the pump fails, the appliance or equipment will be prevented from operating. Pumps shall be installed in accordance with the manufacturer's instructions.
The building shall not be weakened by the installation of any gas piping. In the process of installing or repairing any gas piping, the finished floors, walls, ceilings, tile work or any other part of the building or premises that is required to be changed or replaced shall be left in a safe structural condition in accordance with the requirements of this code.
Truss members and components shall not be cut, drilled, notched, spliced or otherwise altered in any way without the written concurrence and approval of a registered design professional. Alterations resulting in the addition of loads to any member, such as HVAC equipment and water heaters, shall not be permitted without verification that the truss is capable of supporting such additional loading.
Cuts, notches and holes bored in trusses, structural composite lumber, structural glued-laminated members and I-joists are prohibited except where permitted by the manufacturer's recommendations or where the effects of such alterations are specifically considered in the design of the member by a registered design professional.
Appliances shall be located as required by this section, specific requirements elsewhere in this code and the conditions of the equipment and appliance listing.
Appliances shall not be located in sleeping rooms, bathrooms, toilet rooms, storage closets or surgical rooms, or in a space that opens only into such rooms or spaces, except where the installation complies with one of the following:
- The appliance is a direct-vent appliance installed in accordance with the conditions of the listing and the manufacturer's instructions.
- Vented room heaters, wall furnaces, vented decorative appliances, vented gas fireplaces, vented gas fireplace heaters and decorative appliances for installation in vented solid fuel-burning fireplaces are installed in rooms that meet the required volume criteria of Section G2407.5.
- A single wall-mounted unvented room heater is installed in a bathroom and such unvented room heater is equipped as specified in Section G2445.6 and has an input rating not greater than 6,000 Btu/h (1.76 kW). The bathroom shall meet the required volume criteria of Section G2407.5.
- A single wall-mounted unvented room heater is installed in a bedroom and such unvented room heater is equipped as specified in Section G2445.6 and has an input rating not greater than 10,000 Btu/h (2.93 kW). The bedroom shall meet the required volume criteria of Section G2407.5.
- The appliance is installed in a room or space that opens only into a bedroom or bathroom, and such room or space is used for no other purpose and is provided with a solid weather-stripped door equipped with an approved self-closing device. Combustion air shall be taken directly from the outdoors in accordance with Section G2407.6.
- A clothes dryer is installed in a residential bathroom or toilet room having a permanent opening with an area of not less than 100 square inches (0.06 m2) that communicates with a space outside of a sleeping room, bathroom, toilet room or storage closet.
UpCodes Diagram (1)
Appliances installed in outdoor locations shall be either listed for outdoor installation or provided with protection from outdoor environmental factors that influence the operability, durability and safety of the appliance.
Air for combustion, ventilation and dilution of flue gases for appliances installed in buildings shall be provided by application of one of the methods prescribed in Sections G2407.5 through G2407.9. Where the requirements of Section G2407.5 are not met, outdoor air shall be introduced in accordance with one of the methods prescribed in Sections G2407.6 through G2407.9. Direct-vent appliances, gas appliances of other than natural draft design, vented gas appliances not designated as Category I and appliances equipped with power burners, shall be provided with combustion, ventilation and dilution air in accordance with the appliance manufacturer's instructions.
Exception: Type 1 clothes dryers that are provided with makeup air in accordance with Section G2439.5.
Appliances shall be located so as not to interfere with proper circulation of combustion, ventilation and dilution air.
Where used, a draft hood or a barometric draft regulator shall be installed in the same room or enclosure as the appliance served to prevent any difference in pressure between the hood or regulator and the combustion air supply.
Where exhaust fans, clothes dryers and kitchen ventilation systems interfere with the operation of appliances, makeup air shall be provided.
The required volume of indoor air shall be determined in accordance with Section G2407.5.1 or G2407.5.2, except that where the air infiltration rate is known to be less than 0.40 air changes per hour (ACH), Section G2407.5.2 shall be used. The total required volume shall be the sum of the required volume calculated for all appliances located within the space. Rooms communicating directly with the space in which the appliances are installed through openings not furnished with doors, and through combustion air openings sized and located in accordance with Section G2407.5.3, are considered to be part of the required volume.
UpCodes Diagram (1)
The minimum required volume shall be 50 cubic feet per 1,000 Btu/h (4.8 m3/kW) of the appliance input rating.
Where the air infiltration rate of a structure is known, the minimum required volume shall be determined as follows:
For appliances other than fan-assisted, calculate volume using Equation 24-1.
(Equation 24-1)
For fan-assisted appliances, calculate volume using Equation 24-2.
(Equation 24-2)
where:
| Iother | = | All appliances other than fan assisted (input in Btu/h). |
| Ifan | = | Fan-assisted appliance (input in Btu/h). |
| ACH | = | Air change per hour (percent of volume of space exchanged per hour, expressed as a decimal). |
For purposes of this calculation, an infiltration rate greater than 0.60 ACH shall not be used in Equations 24-1 and 24-2.
Openings used to connect indoor spaces shall be sized and located in accordance with Sections G2407.5.3.1 and G2407.5.3.2 (see Figure G2407.5.3).
FIGURE G2407.5.3 (304.5.3)
ALL AIR FROM INSIDE THE BUILDING (see Section G2407.5.3)
Where combining spaces on the same story, each opening shall have a minimum free area of 1 square inch per 1,000 Btu/h (2200 mm2/kW) of the total input rating of all appliances in the space, but not less than 100 square inches (0.06 m2). One permanent opening shall commence within 12 inches (305 mm) of the top and one permanent opening shall commence within 12 inches (305 mm) of the bottom of the enclosure. The minimum dimension of air openings shall be not less than 3 inches (76 mm).
The volumes of spaces in different stories shall be considered to be communicating spaces where such spaces are connected by one or more permanent openings in doors or floors having a total minimum free area of 2 square inches per 1,000 Btu/h (4402 mm2/kW) of total input rating of all appliances.
Outdoor combustion air shall be provided through opening(s) to the outdoors in accordance with Section G2407.6.1 or G2407.6.2. The minimum dimension of air openings shall be not less than 3 inches (76 mm).
UpCodes Diagram (1)
Two permanent openings, one commencing within 12 inches (305 mm) of the top and one commencing within 12 inches (305 mm) of the bottom of the enclosure, shall be provided. The openings shall communicate directly or by ducts with the outdoors or spaces that freely communicate with the outdoors.
Where directly communicating with the outdoors, or where communicating with the outdoors through vertical ducts, each opening shall have a minimum free area of 1 square inch per 4,000 Btu/h (550 mm2/kW) of total input rating of all appliances in the enclosure [see Figures G2407.6.1(1) and G2407.6.1(2)].
Where communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of not less than 1 square inch per 2,000 Btu/h (1100 mm2/kW) of total input rating of all appliances in the enclosure [see Figure G2407.6.1(3)].
FIGURE G2407.6.1(1) [304.6.1(1)]
For SI: 1 foot = 304.8 mm.
FIGURE G2407.6.1(2) [304.6.1(2)]
ALL AIR FROM OUTDOORS THROUGH VENTILATED ATTIC (see Section G2407.6.1)
FIGURE G2407.6.1(3) [304.6.1(3)]
ALL AIR FROM OUTDOORS (see Section G2407.6.1)
One permanent opening, commencing within 12 inches (305 mm) of the top of the enclosure, shall be provided. The appliance shall have clearances of not less than 1 inch (25 mm) from the sides and back and 6 inches (152 mm) from the front of the appliance. The opening shall directly communicate with the outdoors or through a vertical or horizontal duct to the outdoors, or spaces that freely communicate with the outdoors (see Figure G2407.6.2) and shall have a minimum free area of 1 square inch per 3,000 Btu/h (734 mm2/kW) of the total input rating of all appliances located in the enclosure and not less than the sum of the areas of all vent connectors in the space.
FIGURE G2407.6.2 (304.6.2)
SINGLE COMBUSTION AIR OPENING, ALL AIR FROM OUTDOORS (see Section G2407.6.2)
The use of a combination of indoor and outdoor combustion air shall be in accordance with Sections G2407.7.1 through G2407.7.3.
Where used, openings connecting the interior spaces shall comply with Section G2407.5.3.
Outdoor opening(s) shall be located in accordance with Section G2407.6.
The outdoor opening(s) size shall be calculated in accordance with the following:
- The ratio of interior spaces shall be the available volume of all communicating spaces divided by the required volume.
- The outdoor size reduction factor shall be one minus the ratio of interior spaces.
- The minimum size of outdoor opening(s) shall be the full size of outdoor opening(s) calculated in accordance with Section G2407.6, multiplied by the reduction factor. The minimum dimension of air openings shall be not less than 3 inches (76 mm).
Engineered combustion air installations shall provide an adequate supply of combustion, ventilation and dilution air determined using approved engineering methods.
Where all combustion air is provided by a mechanical air supply system, the combustion air shall be supplied from the outdoors at a rate not less than 0.35 cubic feet per minute per 1,000 Btu/h (0.034 m3/min per kW) of total input rating of all appliances located within the space.
Where exhaust fans are installed, makeup air shall be provided to replace the exhausted air.
Each of the appliances served shall be interlocked with the mechanical air supply system to prevent main burner operation when the mechanical air supply system is not in operation.
Where combustion air is provided by the building's mechanical ventilation system, the system shall provide the specified combustion air rate in addition to the required ventilation air.
The required size of openings for combustion, ventilation and dilution air shall be based on the net free area of each opening. Where the free area through a design of louver, grille or screen is known, it shall be used in calculating the size opening required to provide the free area specified. Where the design and free area of louvers and grilles are not known, it shall be assumed that wood louvers will have 25-percent free area and metal louvers and grilles will have 75-percent free area. Screens shall have a mesh size not smaller than 1/4 inch (6.4 mm). Nonmotorized louvers and grilles shall be fixed in the open position. Motorized louvers shall be interlocked with the appliance so that they are proven to be in the full open position prior to main burner ignition and during main burner operation. Means shall be provided to prevent the main burner from igniting if the louvers fail to open during burner start-up and to shut down the main burner if the louvers close during operation.
Combustion air ducts shall comply with all of the following:
- Ducts shall be constructed of galvanized steel complying with Chapter 16 or of a material having equivalent corrosion resistance, strength and rigidity.Exception: Within dwellings units, unobstructed stud and joist spaces shall not be prohibited from conveying combustion air, provided that not more than one required fireblock is removed.
- Ducts shall terminate in an unobstructed space allowing free movement of combustion air to the appliances.
- Ducts shall serve a single enclosure.
- Ducts shall not serve both upper and lower combustion air openings where both such openings are used. The separation between ducts serving upper and lower combustion air openings shall be maintained to the source of combustion air.
- Ducts shall not be screened where terminating in an attic space.
- Horizontal upper combustion air ducts shall not slope downward toward the source of combustion air.
- The remaining space surrounding a chimney liner, gas vent, special gas vent or plastic piping installed within a masonry, metal or factory-built chimney shall not be used to supply combustion air.Exception: Direct-vent gas-fired appliances designed for installation in a solid fuel-burning fireplace where installed in accordance with the manufacturer's instructions.
- Combustion air intake openings located on the exterior of a building shall have the lowest side of such openings located not less than 12 inches (305 mm) vertically from the adjoining finished ground level.
Where corrosive or flammable process fumes or gases, other than products of combustion, are present, means for the disposal of such fumes or gases shall be provided. Such fumes or gases include carbon monoxide, hydrogen sulfide, ammonia, chlorine and halogenated hydrocarbons.
In barbershops, beauty shops and other facilities where chemicals that generate corrosive or flammable products, such as aerosol sprays, are routinely used, nondirect vent-type appliances shall be located in a mechanical room separated or partitioned off from other areas with provisions for combustion air and dilution air from the outdoors. Direct-vent appliances shall be installed in accordance with the appliance manufacturer's instructions.
Equipment and appliances shall be installed as required by the terms of their approval, in accordance with the conditions of listing, the manufacturer's instructions and this code. Manufacturer's installation instructions shall be available on the job site at the time of inspection. Where a code provision is less restrictive than the conditions of the listing of the equipment or appliance or the manufacturer's installation instructions, the conditions of the listing and the manufacturer's installation instructions shall apply.
Unlisted appliances approved in accordance with Section G2404.3 shall be limited to uses recommended by the manufacturer and shall be installed in accordance with the manufacturer's instructions, the provisions of this code and the requirements determined by the code official.
Equipment and appliances having an ignition source shall be elevated such that the source of ignition is not less than 18 inches (457 mm) above the floor in hazardous locations and public garages, private garages, repair garages, motor fuel-dispensing facilities and parking garages. For the purpose of this section, rooms or spaces that are not part of the living space of a dwelling unit and that communicate directly with a private garage through openings shall be considered to be part of the private garage.
Exception: Elevation of the ignition source is not required for appliances that are listed as flammable-vapor-ignition resistant.
In residential garages where appliances are installed in a separate, enclosed space having access only from outside of the garage, such appliances shall be permitted to be installed at floor level, provided that the required combustion air is taken from the exterior of the garage.
Appliances located in private garages shall be installed with a minimum clearance of 6 feet (1829 mm) above the floor.
Exception: The requirements of this section shall not apply where the appliances are protected from motor vehicle impact and installed in accordance with Section G2408.2.
Equipment and appliances installed at grade level shall be supported on a level concrete slab or other approved material extending not less than 3 inches (76 mm) above adjoining grade or shall be suspended not less than 6 inches (152 mm) above adjoining grade. Such supports shall be installed in accordance with the manufacturer's instructions.
Heat-producing equipment and appliances shall be installed to maintain the required clearances to combustible construction as specified in the listing and manufacturer's instructions. Such clearances shall be reduced only in accordance with Section G2409. Clearances to combustibles shall include such considerations as door swing, drawer pull, overhead projections or shelving and window swing. Devices, such as door stops or limits and closers, shall not be used to provide the required clearances.
Appliances shall be supported and connected to the piping so as not to exert undue strain on the connections.
This section shall govern the reduction in required clearances to combustible materials, including gypsum board, and combustible assemblies for chimneys, vents, appliances, devices and equipment. Clearance requirements for air-conditioning equipment and central heating boilers and furnaces shall comply with Sections G2409.3 and G2409.4.
The allowable clearance reduction shall be based on one of the methods specified in Table G2409.2 or shall utilize a reduced clearance protective assembly listed and labeled in accordance with UL 1618. Where required clearances are not listed in Table G2409.2, the reduced clearances shall be determined by linear interpolation between the distances listed in the table. Reduced clearances shall not be derived by extrapolation below the range of the table. The reduction of the required clearances to combustibles for listed and labeled appliances and equipment shall be in accordance with the requirements of this section, except that such clearances shall not be reduced where reduction is specifically prohibited by the terms of the appliance or equipment listing [see Figures G2409.2(1) through 2409.2(3)].
NOTES:
| A | = | The clearance without protection. |
| B | = | The reduced clearance permitted in accordance with Table G2409.2. The protection applied to the construction using combustible material shall extend far enough in each direction to make "C" equal to "A." |
FIGURE G2409.2(1) [308.2(1)]
For SI: 1 inch = 25.4 mm.
FIGURE G2409.2(2) [308.2(2)]
WALL PROTECTOR CLEARANCE REDUCTION SYSTEM
For SI: 1 inch = 25.4 mm.
FIGURE G2409.2(3) [308.2(3)]
TABLE G2409.2 (308.2)
REDUCTION OF CLEARANCES WITH SPECIFIED FORMS OF PROTECTIONa through k
| TYPE OF PROTECTION APPLIED TO AND COVERING ALL SURFACES OF COMBUSTIBLE MATERIAL WITHIN THE DISTANCE SPECIFIED AS THE REQUIRED CLEARANCE WITH NO PROTECTION [see Figures G2409.2(1), G2409.2(2), and G2409.2(3)] | ||||||||||
| WHERE THE REQUIRED CLEARANCE WITH NO PROTECTION FROM APPLIANCE, VENT CONNECTOR, OR SINGLE-WALL METAL PIPE IS: (inches) | ||||||||||
| 36 | 18 | 12 | 9 | 6 | ||||||
| Allowable clearances with specified protection (inches) | ||||||||||
| Use Column 1 for clearances above appliance or horizontal connector. Use Column 2 for clearances from appliance, vertical connector and single-wall metal pipe. | ||||||||||
| Above Col. 1 | Sides and rear Col. 2 | Above Col. 1 | Sides and rear Col. 2 | Above Col. 1 | Sides and rear Col. 2 | Above Col. 1 | Sides and rear Col. 2 | Above Col. 1 | Sides and rear Col. 2 | |
| 1. 31/2-inch-thick masonry wall without ventilated airspace | — | 24 | — | 12 | — | 9 | — | 6 | — | 5 |
| 2. 1/2-inch insulation board over 1-inch glass fiber or mineral wool batts | 24 | 18 | 12 | 9 | 9 | 6 | 6 | 5 | 4 | 3 |
| 3. 0.024-inch (nominal 24 gage) sheet metal over 1-inch glass fiber or mineral wool batts reinforced with wire on rear face with ventilated airspace | 18 | 12 | 9 | 6 | 6 | 4 | 5 | 3 | 3 | 3 |
| 4. 31/2-inch-thick masonry wall with ventilated airspace | — | 12 | — | 6 | — | 6 | — | 6 | — | 6 |
| 5. 0.024-inch (nominal 24 gage) sheet metal with ventilated airspace | 18 | 12 | 9 | 6 | 6 | 4 | 5 | 3 | 3 | 2 |
| 6. 1/2-inch-thick insulation board with ventilated airspace | 18 | 12 | 9 | 6 | 6 | 4 | 5 | 3 | 3 | 3 |
| 7. 0.024-inch (nominal 24 gage) sheet metal with ventilated airspace over 0.024-inch (nominal 24 gage) sheet metal with ventilated airspace | 18 | 12 | 9 | 6 | 6 | 4 | 5 | 3 | 3 | 3 |
| 8. 1-inch glass fiber or mineral wool batts sandwiched between two sheets 0.024-inch (nominal 24 gage) sheet metal with ventilated airspace | 18 | 12 | 9 | 6 | 6 | 4 | 5 | 3 | 3 | 3 |
For SI: 1 inch = 25.4 mm, °C = [(°F — 32)/1.8], 1 pound per cubic foot = 16.02 kg/m3, 1 Btu per inch per square foot per hour per °F = 0.144 W/m2 × K.
- Reduction of clearances from combustible materials shall not interfere with combustion air, draft hood clearance and relief, and accessibility of servicing.
- Clearances shall be measured from the outer surface of the combustible material to the nearest point on the surface of the appliance, disregarding any intervening protection applied to the combustible material.
- Spacers and ties shall be of noncombustible material. A spacer or tie shall not be used directly opposite an appliance or connector.
- For all clearance reduction systems using a ventilated airspace, adequate provision for air circulation shall be provided as described [see Figures G2409.2(2) and G2409.2(3)].
- There shall be not less than 1 inch between clearance reduction systems and combustible walls and ceilings for reduction systems using ventilated airspace.
- Where a wall protector is mounted on a single flat wall away from corners, it shall have a minimum 1-inch air gap. To provide air circulation, the bottom and top edges, or only the side and top edges, or all edges shall be left open.
- Mineral wool batts (blanket or board) shall have a density of 8 pounds per cubic foot and a minimum melting point of 1500°F.
- Insulation material used as part of a clearance reduction system shall have a thermal conductivity of 1.0 Btu per inch per square foot per hour per °F or less.
- There shall be not less than 1 inch between the appliance and the protector. In no case shall the clearance between the appliance and the combustible surface be reduced below that allowed in this table.
- Clearances and thicknesses are minimum; larger clearances and thicknesses are acceptable.
- Listed single-wall connectors shall be installed in accordance with the manufacturer's instructions.
Clearance requirements for indoor air-conditioning appliances shall comply with Sections G2409.3.1 through G2409.3.4.
Air-conditioning appliances shall be installed with clearances in accordance with the manufacturer's instructions.
Air-conditioning appliances shall be permitted to be installed with reduced clearances to combustible material, provided that the combustible material or appliance is protected as described in Table G2409.2 and such reduction is allowed by the manufacturer's instructions.
Where the furnace plenum is adjacent to plaster on metal lath or noncombustible material attached to combustible material, the clearance shall be measured to the surface of the plaster or other noncombustible finish where the clearance specified is 2 inches (51 mm) or less.
Clearance requirements for central-heating boilers and furnaces shall comply with Sections G2409.4.1 through G2409.4.5. The clearance to these appliances shall not interfere with combustion air, draft hood clearance and relief, and accessibility for servicing.
Central-heating furnaces and low-pressure boilers shall be installed with clearances in accordance with the manufacturer's instructions.
Central-heating furnaces and low-pressure boilers shall be permitted to be installed with reduced clearances to combustible material provided that the combustible material or appliance is protected as described in Table G2409.2 and such reduction is allowed by the manufacturer's instructions.
Where the furnace plenum is adjacent to plaster on metal lath or noncombustible material attached to combustible material, the clearance shall be measured to the surface of the plaster or other noncombustible finish where the clearance specified is 2 inches (51 mm) or less.
Gas piping shall not be used as a grounding electrode.
Electrical connections between appliances and the building wiring, including the grounding of the appliances, shall conform to Chapter 34.
Each above-ground portion of a gas piping system other than corrugated stainless steel tubing (CSST) that is likely to become energized shall be electrically continuous and bonded to an effective ground-fault current path. Gas piping other than CSST shall be considered to be bonded where it is connected to an appliance that is connected to the equipment grounding conductor of the circuit that supplies that appliance.
This section applies to corrugated stainless steel tubing (CSST) that is not listed with an arc-resistant jacket or coating system in accordance with ANSI LC1/CSA 6.26. CSST gas piping systems and piping systems containing one or more segments of CSST shall be electrically continuous and bonded to the electrical service grounding electrode system or, where provided, the lightning protection grounding electrode system.
The bonding jumper shall be not smaller than 6 AWG copper wire or equivalent.
The length of the bonding jumper between the connection to a gas piping system and the connection to a grounding electrode system shall not exceed 75 feet (22 860 mm). Any additional grounding electrodes installed to meet this requirement shall be bonded to the electrical service grounding electrode system or, where provided, the lightning protection grounding electrode system.
Bonding connections shall be in accordance with NFPA 70.
Devices used for making the bonding connections shall be listed for the application in accordance with UL 467.
This section applies to corrugated stainless steel tubing (CSST) that is listed with an arc-resistant jacket or coating system in accordance with ANSI LC1/CSA 6.26. The CSST shall be electrically continuous and bonded to an effective ground fault current path. Where any CSST component of a piping system does not have an arc-resistant jacket or coating system, the bonding requirements of Section G2411.2 shall apply. Arc-resistant-jacketed CSST shall be considered to be bonded where it is connected to an appliance that is connected to the appliance grounding conductor of the circuit that supplies that appliance.
This section shall govern the design, installation, modification and maintenance of piping systems. The applicability of this code to piping systems extends from the point of delivery to the connections with the appliances and includes the design, materials, components, fabrication, assembly, installation, testing, inspection, operation and maintenance of such piping systems.
Utility service piping located within buildings shall be installed in accordance with the structural safety and fire protection provisions of this code.
The storage system for liquefied petroleum gas shall be designed and installed in accordance with the Florida Fire Prevention Code and NFPA 58.
In modifying or adding to existing piping systems, sizes shall be maintained in accordance with this chapter.
Where an additional appliance is to be served, the existing piping shall be checked to determine if it has adequate capacity for all appliances served. If inadequate, the existing system shall be enlarged as required or separate piping of adequate capacity shall be provided.
For other than steel pipe and CSST, exposed piping shall be identified by a yellow label marked "Gas" in black letters. The marking shall be spaced at intervals not exceeding 5 feet (1524 mm). The marking shall not be required on piping located in the same room as the appliance served. CSST shall be identified as required by ANSI LC1/CSA 6.26.
Where two or more meters are installed on the same premises but supply separate consumers, the piping systems shall not be interconnected on the outlet side of the meters.
Piping from multiple meter installations shall be marked with an approved permanent identification by the installer so that the piping system supplied by each meter is readily identifiable.
Pipe utilized for the installation, extension and alteration of any piping system shall be sized to supply the full number of outlets for the intended purpose and shall be sized in accordance with Section G2413.
Piping, tubing and fittings shall be manufactured to the applicable referenced standards, specifications and performance criteria listed in Section G2414 and shall be identified in accordance with Section G2412.9.
Piping systems shall be of such size and so installed as to provide a supply of gas sufficient to meet the maximum demand and supply gas to each appliance inlet at not less than the minimum supply pressure required by the appliance.
The volumetric flow rate of gas to be provided shall be the sum of the maximum input of the appliances served.
The total connected hourly load shall be used as the basis for pipe sizing, assuming that all appliances could be operating at full capacity simultaneously. Where a diversity of load can be established, pipe sizing shall be permitted to be based on such loads.
The volumetric flow rate of gas to be provided shall be adjusted for altitude where the installation is above 2,000 feet (610 m) in elevation.
Gas piping shall be sized in accordance with one of the following:
- Pipe sizing tables or sizing equations in accordance with Section G2413.4 or G2413.5, as applicable.
- The sizing tables included in a listed piping system's manufacturer's installation instructions.
- Approved engineering methods.
This section applies to piping materials other than noncorrugated stainless steel tubing. Where Tables G2413.4(1) through G2413.4(21) are used to size piping or tubing, the pipe length shall be determined in accordance with Section G2413.4.1, G2413.4.2 or G2413.4.3.
Where Equations 24-3 and 24-4 are used to size piping or tubing, the pipe or tubing shall have smooth inside walls and the pipe length shall be determined in accordance with Section G2413.4.1, G2413.4.2 or G2413.4.3.
-
Low-pressure gas equation [less than 11/2 pounds per square inch (psi) (10.3 kPa)]:
(Equation 24-3) -
High-pressure gas equation [11/2 psi (10.3 kPa) and above]:
(Equation 24-4)where:Cr = Value determined by Table G2413.4. D = Inside diameter of pipe, inches (mm). Q = Input rate appliance(s), cubic feet per hour at 60°F (16°C) and 30-inch mercury column. P1 = Upstream pressure, psia (P1 + 14.7). P2 = Downstream pressure, psia (P2 + 14.7). L = Equivalent length of pipe, feet. Y = Value determined by Table G2413.4. ΔH = Pressure drop, inch water column (27.7-inch water column = 1 psi).
TABLE G2413.4 (402.4)
Cr AND Y VALUES FOR NATURAL GAS AND UNDILUTED PROPANE AT STANDARD CONDITIONS
| GAS | EQUATION FACTORS | |
| Cr | Y | |
| Natural gas | 0.6094 | 0.9992 |
| Undiluted propane | 1.2462 | 0.9910 |
For SI: 1 cubic foot = 0.028 m3, 1 foot = 305 mm, 1-inch water column = 0.249 kPa, 1 pound per square inch = 6.895 kPa, 1 British thermal unit per hour = 0.293 W.
TABLE G2413.4(1) [402.4(2)]
SCHEDULE 40 METALLIC PIPE
| Gas | Natural |
| Inlet Pressure | Less than 2 psi |
| Pressure Drop | 0.5 in. w.c. |
| Specific Gravity | 0.60 |
| PIPE SIZE (inches) | ||||||||||||||
| Nominal | 1/2 | 3/4 | 1 | 11/4 | 11/2 | 2 | 21/2 | 3 | 4 | 5 | 6 | 8 | 10 | 12 |
| Actual ID | 0.622 | 0.824 | 1.049 | 1.380 | 1.610 | 2.067 | 2.469 | 3.068 | 4.026 | 5.047 | 6.065 | 7.981 | 10.020 | 11.938 |
| Length (ft) | Capacity in Cubic Feet of Gas per Hour | |||||||||||||
| 10 | 172 | 360 | 678 | 1,390 | 2,090 | 4,020 | 6,400 | 11,300 | 23,100 | 41,800 | 67,600 | 139,000 | 252,000 | 399,000 |
| 20 | 118 | 247 | 466 | 957 | 1,430 | 2,760 | 4,400 | 7,780 | 15,900 | 28,700 | 46,500 | 95,500 | 173,000 | 275,000 |
| 30 | 95 | 199 | 374 | 768 | 1,150 | 2,220 | 3,530 | 6,250 | 12,700 | 23,000 | 37,300 | 76,700 | 139,000 | 220,000 |
| 40 | 81 | 170 | 320 | 657 | 985 | 1,900 | 3,020 | 5,350 | 10,900 | 19,700 | 31,900 | 65,600 | 119,000 | 189,000 |
| 50 | 72 | 151 | 284 | 583 | 873 | 1,680 | 2,680 | 4,740 | 9,660 | 17,500 | 28,300 | 58,200 | 106,000 | 167,000 |
| 60 | 65 | 137 | 257 | 528 | 791 | 1,520 | 2,430 | 4,290 | 8,760 | 15,800 | 25,600 | 52,700 | 95,700 | 152,000 |
| 70 | 60 | 126 | 237 | 486 | 728 | 1,400 | 2,230 | 3,950 | 8,050 | 14,600 | 23,600 | 48,500 | 88,100 | 139,000 |
| 80 | 56 | 117 | 220 | 452 | 677 | 1,300 | 2,080 | 3,670 | 7,490 | 13,600 | 22,000 | 45,100 | 81,900 | 130,000 |
| 90 | 52 | 110 | 207 | 424 | 635 | 1,220 | 1,950 | 3,450 | 7,030 | 12,700 | 20,600 | 42,300 | 76,900 | 122,000 |
| 100 | 50 | 104 | 195 | 400 | 600 | 1,160 | 1,840 | 3,260 | 6,640 | 12,000 | 19,500 | 40,000 | 72,600 | 115,000 |
| 125 | 44 | 92 | 173 | 355 | 532 | 1,020 | 1,630 | 2,890 | 5,890 | 10,600 | 17,200 | 35,400 | 64,300 | 102,000 |
| 150 | 40 | 83 | 157 | 322 | 482 | 928 | 1,480 | 2,610 | 5,330 | 9,650 | 15,600 | 32,100 | 58,300 | 92,300 |
| 175 | 37 | 77 | 144 | 296 | 443 | 854 | 1,360 | 2,410 | 4,910 | 8,880 | 14,400 | 29,500 | 53,600 | 84,900 |
| 200 | 34 | 71 | 134 | 275 | 412 | 794 | 1,270 | 2,240 | 4,560 | 8,260 | 13,400 | 27,500 | 49,900 | 79,000 |
| 250 | 30 | 63 | 119 | 244 | 366 | 704 | 1,120 | 1,980 | 4,050 | 7,320 | 11,900 | 24,300 | 44,200 | 70,000 |
| 300 | 27 | 57 | 108 | 221 | 331 | 638 | 1,020 | 1,800 | 3,670 | 6,630 | 10,700 | 22,100 | 40,100 | 63,400 |
| 350 | 25 | 53 | 99 | 203 | 305 | 587 | 935 | 1,650 | 3,370 | 6,100 | 9,880 | 20,300 | 36,900 | 58,400 |
| 400 | 23 | 49 | 92 | 189 | 283 | 546 | 870 | 1,540 | 3,140 | 5,680 | 9,190 | 18,900 | 34,300 | 54,300 |
| 450 | 22 | 46 | 86 | 177 | 266 | 512 | 816 | 1,440 | 2,940 | 5,330 | 8,620 | 17,700 | 32,200 | 50,900 |
| 500 | 21 | 43 | 82 | 168 | 251 | 484 | 771 | 1,360 | 2,780 | 5,030 | 8,150 | 16,700 | 30,400 | 48,100 |
| 550 | 20 | 41 | 78 | 159 | 239 | 459 | 732 | 1,290 | 2,640 | 4,780 | 7,740 | 15,900 | 28,900 | 45,700 |
| 600 | 19 | 39 | 74 | 152 | 228 | 438 | 699 | 1,240 | 2,520 | 4,560 | 7,380 | 15,200 | 27,500 | 43,600 |
| 650 | 18 | 38 | 71 | 145 | 218 | 420 | 669 | 1,180 | 2,410 | 4,360 | 7,070 | 14,500 | 26,400 | 41,800 |
| 700 | 17 | 36 | 68 | 140 | 209 | 403 | 643 | 1,140 | 2,320 | 4,190 | 6,790 | 14,000 | 25,300 | 40,100 |
| 750 | 17 | 35 | 66 | 135 | 202 | 389 | 619 | 1,090 | 2,230 | 4,040 | 6,540 | 13,400 | 24,400 | 38,600 |
| 800 | 16 | 34 | 63 | 130 | 195 | 375 | 598 | 1,060 | 2,160 | 3,900 | 6,320 | 13,000 | 23,600 | 37,300 |
| 850 | 16 | 33 | 61 | 126 | 189 | 363 | 579 | 1,020 | 2,090 | 3,780 | 6,110 | 12,600 | 22,800 | 36,100 |
| 900 | 15 | 32 | 59 | 122 | 183 | 352 | 561 | 992 | 2,020 | 3,660 | 5,930 | 12,200 | 22,100 | 35,000 |
| 950 | 15 | 31 | 58 | 118 | 178 | 342 | 545 | 963 | 1,960 | 3,550 | 5,760 | 11,800 | 21,500 | 34,000 |
| 1,000 | 14 | 30 | 56 | 115 | 173 | 333 | 530 | 937 | 1,910 | 3,460 | 5,600 | 11,500 | 20,900 | 33,100 |
| 1,100 | 14 | 28 | 53 | 109 | 164 | 316 | 503 | 890 | 1,810 | 3,280 | 5,320 | 10,900 | 19,800 | 31,400 |
| 1,200 | 13 | 27 | 51 | 104 | 156 | 301 | 480 | 849 | 1,730 | 3,130 | 5,070 | 10,400 | 18,900 | 30,000 |
| 1,300 | 12 | 26 | 49 | 100 | 150 | 289 | 460 | 813 | 1,660 | 3,000 | 4,860 | 9,980 | 18,100 | 28,700 |
| 1,400 | 12 | 25 | 47 | 96 | 144 | 277 | 442 | 781 | 1,590 | 2,880 | 4,670 | 9,590 | 17,400 | 27,600 |
| 1,500 | 11 | 24 | 45 | 93 | 139 | 267 | 426 | 752 | 1,530 | 2,780 | 4,500 | 9,240 | 16,800 | 26,600 |
| 1,600 | 11 | 23 | 44 | 89 | 134 | 258 | 411 | 727 | 1,480 | 2,680 | 4,340 | 8,920 | 16,200 | 25,600 |
| 1,700 | 11 | 22 | 42 | 86 | 130 | 250 | 398 | 703 | 1,430 | 2,590 | 4,200 | 8,630 | 15,700 | 24,800 |
| 1,800 | 10 | 22 | 41 | 84 | 126 | 242 | 386 | 682 | 1,390 | 2,520 | 4,070 | 8,370 | 15,200 | 24,100 |
| 1,900 | 10 | 21 | 40 | 81 | 122 | 235 | 375 | 662 | 1,350 | 2,440 | 3,960 | 8,130 | 14,800 | 23,400 |
| 2,000 | NA | 20 | 39 | 79 | 119 | 229 | 364 | 644 | 1,310 | 2,380 | 3,850 | 7,910 | 14,400 | 22,700 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
- NA means a flow of less than 10 cfh.
- Table entries have been rounded to three significant digits.
TABLE G2413.4(2) [402.4(5)]
SCHEDULE 40 METALLIC PIPE
| Gas | Natural |
| Inlet Pressure | 2.0 psi |
| Pressure Drop | 1.0 psi |
| Specific Gravity | 0.60 |
| PIPE SIZE (inches) | |||||||||
| Nominal | 1/2 | 3/4 | 1 | 11/4 | 11/2 | 2 | 21/2 | 3 | 4 |
| Actual ID | 0.622 | 0.824 | 1.049 | 1.380 | 1.610 | 2.067 | 2.469 | 3.068 | 4.026 |
| Length (ft) | Capacity in Cubic Feet of Gas per Hour | ||||||||
| 10 | 1,510 | 3,040 | 5,560 | 11,400 | 17,100 | 32,900 | 52,500 | 92,800 | 189,000 |
| 20 | 1,070 | 2,150 | 3,930 | 8,070 | 12,100 | 23,300 | 37,100 | 65,600 | 134,000 |
| 30 | 869 | 1,760 | 3,210 | 6,590 | 9,880 | 19,000 | 30,300 | 53,600 | 109,000 |
| 40 | 753 | 1,520 | 2,780 | 5,710 | 8,550 | 16,500 | 26,300 | 46,400 | 94,700 |
| 50 | 673 | 1,360 | 2,490 | 5,110 | 7,650 | 14,700 | 23,500 | 41,500 | 84,700 |
| 60 | 615 | 1,240 | 2,270 | 4,660 | 6,980 | 13,500 | 21,400 | 37,900 | 77,300 |
| 70 | 569 | 1,150 | 2,100 | 4,320 | 6,470 | 12,500 | 19,900 | 35,100 | 71,600 |
| 80 | 532 | 1,080 | 1,970 | 4,040 | 6,050 | 11,700 | 18,600 | 32,800 | 67,000 |
| 90 | 502 | 1,010 | 1,850 | 3,810 | 5,700 | 11,000 | 17,500 | 30,900 | 63,100 |
| 100 | 462 | 934 | 1,710 | 3,510 | 5,260 | 10,100 | 16,100 | 28,500 | 58,200 |
| 125 | 414 | 836 | 1,530 | 3,140 | 4,700 | 9,060 | 14,400 | 25,500 | 52,100 |
| 150 | 372 | 751 | 1,370 | 2,820 | 4,220 | 8,130 | 13,000 | 22,900 | 46,700 |
| 175 | 344 | 695 | 1,270 | 2,601 | 3,910 | 7,530 | 12,000 | 21,200 | 43,300 |
| 200 | 318 | 642 | 1,170 | 2,410 | 3,610 | 6,960 | 11,100 | 19,600 | 40,000 |
| 250 | 279 | 583 | 1,040 | 2,140 | 3,210 | 6,180 | 9,850 | 17,400 | 35,500 |
| 300 | 253 | 528 | 945 | 1,940 | 2,910 | 5,600 | 8,920 | 15,800 | 32,200 |
| 350 | 232 | 486 | 869 | 1,790 | 2,670 | 5,150 | 8,210 | 14,500 | 29,600 |
| 400 | 216 | 452 | 809 | 1,660 | 2,490 | 4,790 | 7,640 | 13,500 | 27,500 |
| 450 | 203 | 424 | 759 | 1,560 | 2,330 | 4,500 | 7,170 | 12,700 | 25,800 |
| 500 | 192 | 401 | 717 | 1,470 | 2,210 | 4,250 | 6,770 | 12,000 | 24,400 |
| 550 | 182 | 381 | 681 | 1,400 | 2,090 | 4,030 | 6,430 | 11,400 | 23,200 |
| 600 | 174 | 363 | 650 | 1,330 | 2,000 | 3,850 | 6,130 | 10,800 | 22,100 |
| 650 | 166 | 348 | 622 | 1,280 | 1,910 | 3,680 | 5,870 | 10,400 | 21,200 |
| 700 | 160 | 334 | 598 | 1,230 | 1,840 | 3,540 | 5,640 | 9,970 | 20,300 |
| 750 | 154 | 322 | 576 | 1,180 | 1,770 | 3,410 | 5,440 | 9,610 | 19,600 |
| 800 | 149 | 311 | 556 | 1,140 | 1,710 | 3,290 | 5,250 | 9,280 | 18,900 |
| 850 | 144 | 301 | 538 | 1,100 | 1,650 | 3,190 | 5,080 | 8,980 | 18,300 |
| 900 | 139 | 292 | 522 | 1,070 | 1,600 | 3,090 | 4,930 | 8,710 | 17,800 |
| 950 | 135 | 283 | 507 | 1,040 | 1,560 | 3,000 | 4,780 | 8,460 | 17,200 |
| 1,000 | 132 | 275 | 493 | 1,010 | 1,520 | 2,920 | 4,650 | 8,220 | 16,800 |
| 1,100 | 125 | 262 | 468 | 960 | 1,440 | 2,770 | 4,420 | 7,810 | 15,900 |
| 1,200 | 119 | 250 | 446 | 917 | 1,370 | 2,640 | 4,220 | 7,450 | 15,200 |
| 1,300 | 114 | 239 | 427 | 878 | 1,320 | 2,530 | 4,040 | 7,140 | 14,600 |
| 1,400 | 110 | 230 | 411 | 843 | 1,260 | 2,430 | 3,880 | 6,860 | 14,000 |
| 1,500 | 106 | 221 | 396 | 812 | 1,220 | 2,340 | 3,740 | 6,600 | 13,500 |
| 1,600 | 102 | 214 | 382 | 784 | 1,180 | 2,260 | 3,610 | 6,380 | 13,000 |
| 1,700 | 99 | 207 | 370 | 759 | 1,140 | 2,190 | 3,490 | 6,170 | 12,600 |
| 1,800 | 96 | 200 | 358 | 736 | 1,100 | 2,120 | 3,390 | 5,980 | 12,200 |
| 1,900 | 93 | 195 | 348 | 715 | 1,070 | 2,060 | 3,290 | 5,810 | 11,900 |
| 2,000 | 91 | 189 | 339 | 695 | 1,040 | 2,010 | 3,200 | 5,650 | 11,500 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: Table entries have been rounded to three significant digits.
TABLE G2413.4(3) [402.4(9)]
SEMIRIGID COPPER TUBING
| Gas | Natural |
| Inlet Pressure | Less than 2 psi |
| Pressure Drop | 0.5 in. w.c. |
| Specific Gravity | 0.60 |
| TUBE SIZE (inches) | ||||||||||
| Nominal | K & L | 1/4 | 3/8 | 1/2 | 5/8 | 3/4 | 1 | 11/4 | 11/2 | 2 |
| ACR | 3/8 | 1/2 | 5/8 | 3/4 | 7/8 | 11/8 | 13/8 | — | — | |
| Outside | 0.375 | 0.500 | 0.625 | 0.750 | 0.875 | 1.125 | 1.375 | 1.625 | 2.125 | |
| Inside | 0.305 | 0.402 | 0.527 | 0.652 | 0.745 | 0.995 | 1.245 | 1.481 | 1.959 | |
| Length (ft) | Capacity in Cubic Feet of Gas per Hour | |||||||||
| 10 | 27 | 55 | 111 | 195 | 276 | 590 | 1,060 | 1,680 | 3,490 | |
| 20 | 18 | 38 | 77 | 134 | 190 | 406 | 730 | 1,150 | 2,400 | |
| 30 | 15 | 30 | 61 | 107 | 152 | 326 | 586 | 925 | 1,930 | |
| 40 | 13 | 26 | 53 | 92 | 131 | 279 | 502 | 791 | 1,650 | |
| 50 | 11 | 23 | 47 | 82 | 116 | 247 | 445 | 701 | 1,460 | |
| 60 | 10 | 21 | 42 | 74 | 105 | 224 | 403 | 635 | 1,320 | |
| 70 | NA | 19 | 39 | 68 | 96 | 206 | 371 | 585 | 1,220 | |
| 80 | NA | 18 | 36 | 63 | 90 | 192 | 345 | 544 | 1,130 | |
| 90 | NA | 17 | 34 | 59 | 84 | 180 | 324 | 510 | 1,060 | |
| 100 | NA | 16 | 32 | 56 | 79 | 170 | 306 | 482 | 1,000 | |
| 125 | NA | 14 | 28 | 50 | 70 | 151 | 271 | 427 | 890 | |
| 150 | NA | 13 | 26 | 45 | 64 | 136 | 245 | 387 | 806 | |
| 175 | NA | 12 | 24 | 41 | 59 | 125 | 226 | 356 | 742 | |
| 200 | NA | 11 | 22 | 39 | 55 | 117 | 210 | 331 | 690 | |
| 250 | NA | NA | 20 | 34 | 48 | 103 | 186 | 294 | 612 | |
| 300 | NA | NA | 18 | 31 | 44 | 94 | 169 | 266 | 554 | |
| 350 | NA | NA | 16 | 28 | 40 | 86 | 155 | 245 | 510 | |
| 400 | NA | NA | 15 | 26 | 38 | 80 | 144 | 228 | 474 | |
| 450 | NA | NA | 14 | 25 | 35 | 75 | 135 | 214 | 445 | |
| 500 | NA | NA | 13 | 23 | 33 | 71 | 128 | 202 | 420 | |
| 550 | NA | NA | 13 | 22 | 32 | 68 | 122 | 192 | 399 | |
| 600 | NA | NA | 12 | 21 | 30 | 64 | 116 | 183 | 381 | |
| 650 | NA | NA | 12 | 20 | 29 | 62 | 111 | 175 | 365 | |
| 700 | NA | NA | 11 | 20 | 28 | 59 | 107 | 168 | 350 | |
| 750 | NA | NA | 11 | 19 | 27 | 57 | 103 | 162 | 338 | |
| 800 | NA | NA | 10 | 18 | 26 | 55 | 99 | 156 | 326 | |
| 850 | NA | NA | 10 | 18 | 25 | 53 | 96 | 151 | 315 | |
| 900 | NA | NA | NA | 17 | 24 | 52 | 93 | 147 | 306 | |
| 950 | NA | NA | NA | 17 | 24 | 50 | 90 | 143 | 297 | |
| 1,000 | NA | NA | NA | 16 | 23 | 49 | 88 | 139 | 289 | |
| 1,100 | NA | NA | NA | 15 | 22 | 46 | 84 | 132 | 274 | |
| 1,200 | NA | NA | NA | 15 | 21 | 44 | 80 | 126 | 262 | |
| 1,300 | NA | NA | NA | 14 | 20 | 42 | 76 | 120 | 251 | |
| 1,400 | NA | NA | NA | 13 | 19 | 41 | 73 | 116 | 241 | |
| 1,500 | NA | NA | NA | 13 | 18 | 39 | 71 | 111 | 232 | |
| 1,600 | NA | NA | NA | 13 | 18 | 38 | 68 | 108 | 224 | |
| 1,700 | NA | NA | NA | 12 | 17 | 37 | 66 | 104 | 217 | |
| 1,800 | NA | NA | NA | 12 | 17 | 36 | 64 | 101 | 210 | |
| 1,900 | NA | NA | NA | 11 | 16 | 35 | 62 | 98 | 204 | |
| 2,000 | NA | NA | NA | 11 | 16 | 34 | 60 | 95 | 199 | |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
TABLE G2413.4(4) [402.4(12)]
SEMIRIGID COPPER TUBING
| Gas | Natural |
| Inlet Pressure | 2.0 psi |
| Pressure Drop | 1.0 psi |
| Specific Gravity | 0.60 |
| TUBE SIZE (inches) | ||||||||||
| Nominal | K & L | 1/4 | 3/8 | 1/2 | 5/8 | 3/4 | 1 | 11/4 | 11/2 | 2 |
| ACR | 3/8 | 1/2 | 5/8 | 3/4 | 7/8 | 11/8 | 13/8 | — | — | |
| Outside | 0.375 | 0.500 | 0.625 | 0.750 | 0.875 | 1.125 | 1.375 | 1.625 | 2.125 | |
| Inside | 0.305 | 0.402 | 0.527 | 0.652 | 0.745 | 0.995 | 1.245 | 1.481 | 1.959 | |
| Length (ft) | Capacity in Cubic Feet of Gas per Hour | |||||||||
| 10 | 245 | 506 | 1,030 | 1,800 | 2,550 | 5,450 | 9,820 | 15,500 | 32,200 | |
| 20 | 169 | 348 | 708 | 1,240 | 1,760 | 3,750 | 6,750 | 10,600 | 22,200 | |
| 30 | 135 | 279 | 568 | 993 | 1,410 | 3,010 | 5,420 | 8,550 | 17,800 | |
| 40 | 116 | 239 | 486 | 850 | 1,210 | 2,580 | 4,640 | 7,310 | 15,200 | |
| 50 | 103 | 212 | 431 | 754 | 1,070 | 2,280 | 4,110 | 6,480 | 13,500 | |
| 60 | 93 | 192 | 391 | 683 | 969 | 2,070 | 3,730 | 5,870 | 12,200 | |
| 70 | 86 | 177 | 359 | 628 | 891 | 1,900 | 3,430 | 5,400 | 11,300 | |
| 80 | 80 | 164 | 334 | 584 | 829 | 1,770 | 3,190 | 5,030 | 10,500 | |
| 90 | 75 | 154 | 314 | 548 | 778 | 1,660 | 2,990 | 4,720 | 9,820 | |
| 100 | 71 | 146 | 296 | 518 | 735 | 1,570 | 2,830 | 4,450 | 9,280 | |
| 125 | 63 | 129 | 263 | 459 | 651 | 1,390 | 2,500 | 3,950 | 8,220 | |
| 150 | 57 | 117 | 238 | 416 | 590 | 1,260 | 2,270 | 3,580 | 7,450 | |
| 175 | 52 | 108 | 219 | 383 | 543 | 1,160 | 2,090 | 3,290 | 6,850 | |
| 200 | 49 | 100 | 204 | 356 | 505 | 1,080 | 1,940 | 3,060 | 6,380 | |
| 250 | 43 | 89 | 181 | 315 | 448 | 956 | 1,720 | 2,710 | 5,650 | |
| 300 | 39 | 80 | 164 | 286 | 406 | 866 | 1,560 | 2,460 | 5,120 | |
| 350 | 36 | 74 | 150 | 263 | 373 | 797 | 1,430 | 2,260 | 4,710 | |
| 400 | 33 | 69 | 140 | 245 | 347 | 741 | 1,330 | 2,100 | 4,380 | |
| 450 | 31 | 65 | 131 | 230 | 326 | 696 | 1,250 | 1,970 | 4,110 | |
| 500 | 30 | 61 | 124 | 217 | 308 | 657 | 1,180 | 1,870 | 3,880 | |
| 550 | 28 | 58 | 118 | 206 | 292 | 624 | 1,120 | 1,770 | 3,690 | |
| 600 | 27 | 55 | 112 | 196 | 279 | 595 | 1,070 | 1,690 | 3,520 | |
| 650 | 26 | 53 | 108 | 188 | 267 | 570 | 1,030 | 1,620 | 3,370 | |
| 700 | 25 | 51 | 103 | 181 | 256 | 548 | 986 | 1,550 | 3,240 | |
| 750 | 24 | 49 | 100 | 174 | 247 | 528 | 950 | 1,500 | 3,120 | |
| 800 | 23 | 47 | 96 | 168 | 239 | 510 | 917 | 1,450 | 3,010 | |
| 850 | 22 | 46 | 93 | 163 | 231 | 493 | 888 | 1,400 | 2,920 | |
| 900 | 22 | 44 | 90 | 158 | 224 | 478 | 861 | 1,360 | 2,830 | |
| 950 | 21 | 43 | 88 | 153 | 217 | 464 | 836 | 1,320 | 2,740 | |
| 1,000 | 20 | 42 | 85 | 149 | 211 | 452 | 813 | 1,280 | 2,670 | |
| 1,100 | 19 | 40 | 81 | 142 | 201 | 429 | 772 | 1,220 | 2,540 | |
| 1,200 | 18 | 38 | 77 | 135 | 192 | 409 | 737 | 1,160 | 2,420 | |
| 1,300 | 18 | 36 | 74 | 129 | 183 | 392 | 705 | 1,110 | 2,320 | |
| 1,400 | 17 | 35 | 71 | 124 | 176 | 376 | 678 | 1,070 | 2,230 | |
| 1,500 | 16 | 34 | 68 | 120 | 170 | 363 | 653 | 1,030 | 2,140 | |
| 1,600 | 16 | 33 | 66 | 116 | 164 | 350 | 630 | 994 | 2,070 | |
| 1,700 | 15 | 31 | 64 | 112 | 159 | 339 | 610 | 962 | 2,000 | |
| 1,800 | 15 | 30 | 62 | 108 | 154 | 329 | 592 | 933 | 1,940 | |
| 1,900 | 14 | 30 | 60 | 105 | 149 | 319 | 575 | 906 | 1,890 | |
| 2,000 | 14 | 29 | 59 | 102 | 145 | 310 | 559 | 881 | 1,830 | |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
TABLE G2413.4(5) [402.4(15)]
CORRUGATED STAINLESS STEEL TUBING (CSST)
| Gas | Natural |
| Inlet Pressure | Less than 2 psi |
| Pressure Drop | 0.5 in. w.c. |
| Specific Gravity | 0.60 |
| TUBE SIZE (EHD) | ||||||||||||||
| Flow
Designation
|
13 | 15 | 18 | 19 | 23 | 25 | 30 | 31 | 37 | 39 | 46 | 48 | 60 | 62 |
| Length (ft) | Capacity in Cubic Feet of Gas per Hour | |||||||||||||
| 5 | 46 | 63 | 115 | 134 | 225 | 270 | 471 | 546 | 895 | 1,037 | 1,790 | 2,070 | 3,660 | 4,140 |
| 10 | 32 | 44 | 82 | 95 | 161 | 192 | 330 | 383 | 639 | 746 | 1,260 | 1,470 | 2,600 | 2,930 |
| 15 | 25 | 35 | 66 | 77 | 132 | 157 | 267 | 310 | 524 | 615 | 1,030 | 1,200 | 2,140 | 2,400 |
| 20 | 22 | 31 | 58 | 67 | 116 | 137 | 231 | 269 | 456 | 536 | 888 | 1,050 | 1,850 | 2,080 |
| 25 | 19 | 27 | 52 | 60 | 104 | 122 | 206 | 240 | 409 | 482 | 793 | 936 | 1,660 | 1,860 |
| 30 | 18 | 25 | 47 | 55 | 96 | 112 | 188 | 218 | 374 | 442 | 723 | 856 | 1,520 | 1,700 |
| 40 | 15 | 21 | 41 | 47 | 83 | 97 | 162 | 188 | 325 | 386 | 625 | 742 | 1,320 | 1,470 |
| 50 | 13 | 19 | 37 | 42 | 75 | 87 | 144 | 168 | 292 | 347 | 559 | 665 | 1,180 | 1,320 |
| 60 | 12 | 17 | 34 | 38 | 68 | 80 | 131 | 153 | 267 | 318 | 509 | 608 | 1,080 | 1,200 |
| 70 | 11 | 16 | 31 | 36 | 63 | 74 | 121 | 141 | 248 | 295 | 471 | 563 | 1,000 | 1,110 |
| 80 | 10 | 15 | 29 | 33 | 60 | 69 | 113 | 132 | 232 | 277 | 440 | 527 | 940 | 1,040 |
| 90 | 10 | 14 | 28 | 32 | 57 | 65 | 107 | 125 | 219 | 262 | 415 | 498 | 887 | 983 |
| 100 | 9 | 13 | 26 | 30 | 54 | 62 | 101 | 118 | 208 | 249 | 393 | 472 | 843 | 933 |
| 150 | 7 | 10 | 20 | 23 | 42 | 48 | 78 | 91 | 171 | 205 | 320 | 387 | 691 | 762 |
| 200 | 6 | 9 | 18 | 21 | 38 | 44 | 71 | 82 | 148 | 179 | 277 | 336 | 600 | 661 |
| 250 | 5 | 8 | 16 | 19 | 34 | 39 | 63 | 74 | 133 | 161 | 247 | 301 | 538 | 591 |
| 300 | 5 | 7 | 15 | 17 | 32 | 36 | 57 | 67 | 95 | 148 | 226 | 275 | 492 | 540 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
- Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n, where L is additional length (feet) of tubing and n is the number of additional fittings or bends.
- EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
- Table entries have been rounded to three significant digits.
TABLE G2413.4(6) [402.4(18)]
CORRUGATED STAINLESS STEEL TUBING (CSST)
| Gas | Natural |
| Inlet Pressure | 2.0 psi |
| Pressure Drop | 1.0 psi |
| Specific Gravity | 0.60 |
| TUBE SIZE (EHD) | ||||||||||||||
| Flow
Designation
|
13 | 15 | 18 | 19 | 23 | 25 | 30 | 31 | 37 | 39 | 46 | 48 | 60 | 62 |
| Length (ft) | Capacity in Cubic Feet of Gas Per Hour | |||||||||||||
| 10 | 270 | 353 | 587 | 700 | 1,100 | 1,370 | 2,590 | 2,990 | 4,510 | 5,037 | 9,600 | 10,700 | 18,600 | 21,600 |
| 25 | 166 | 220 | 374 | 444 | 709 | 876 | 1,620 | 1,870 | 2,890 | 3,258 | 6,040 | 6,780 | 11,900 | 13,700 |
| 30 | 151 | 200 | 342 | 405 | 650 | 801 | 1,480 | 1,700 | 2,640 | 2,987 | 5,510 | 6,200 | 10,900 | 12,500 |
| 40 | 129 | 172 | 297 | 351 | 567 | 696 | 1,270 | 1,470 | 2,300 | 2,605 | 4,760 | 5,380 | 9,440 | 10,900 |
| 50 | 115 | 154 | 266 | 314 | 510 | 624 | 1,140 | 1,310 | 2,060 | 2,343 | 4,260 | 4,820 | 8,470 | 9,720 |
| 75 | 93 | 124 | 218 | 257 | 420 | 512 | 922 | 1,070 | 1,690 | 1,932 | 3,470 | 3,950 | 6,940 | 7,940 |
| 80 | 89 | 120 | 211 | 249 | 407 | 496 | 892 | 1,030 | 1,640 | 1,874 | 3,360 | 3,820 | 6,730 | 7,690 |
| 100 | 79 | 107 | 189 | 222 | 366 | 445 | 795 | 920 | 1,470 | 1,685 | 3,000 | 3,420 | 6,030 | 6,880 |
| 150 | 64 | 87 | 155 | 182 | 302 | 364 | 646 | 748 | 1,210 | 1,389 | 2,440 | 2,800 | 4,940 | 5,620 |
| 200 | 55 | 75 | 135 | 157 | 263 | 317 | 557 | 645 | 1,050 | 1,212 | 2,110 | 2,430 | 4,290 | 4,870 |
| 250 | 49 | 67 | 121 | 141 | 236 | 284 | 497 | 576 | 941 | 1,090 | 1,890 | 2,180 | 3,850 | 4,360 |
| 300 | 44 | 61 | 110 | 129 | 217 | 260 | 453 | 525 | 862 | 999 | 1,720 | 1,990 | 3,520 | 3,980 |
| 400 | 38 | 52 | 96 | 111 | 189 | 225 | 390 | 453 | 749 | 871 | 1,490 | 1,730 | 3,060 | 3,450 |
| 500 | 34 | 46 | 86 | 100 | 170 | 202 | 348 | 404 | 552 | 783 | 1,330 | 1,550 | 2,740 | 3,090 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
- Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds 3/4 psi, DO NOT USE THIS TABLE. Consult with the regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator can vary with flow rate.
- CAUTION: Capacities shown in the table might exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guidance.
- Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings or bends.
- EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
- Table entries have been rounded to three significant digits.
TABLE G2413.4(7) [402.4(21)]
POLYETHYLENE PLASTIC PIPE
| Gas | Natural |
| Inlet Pressure | Less than 2 psi |
| Pressure Drop | 0.5 in. w.c. |
| Specific Gravity | 0.60 |
| PIPE SIZE (inches) | ||||||
| Nominal OD | 1/2 | 3/4 | 1 | 11/4 | 11/2 | 2 |
| Designation | SDR 9 | SDR 11 | SDR 11 | SDR 10 | SDR 11 | SDR 11 |
| Actual ID | 0.660 | 0.860 | 1.077 | 1.328 | 1.554 | 1.943 |
| Length (ft) | Capacity in Cubic Feet of Gas per Hour | |||||
| 10 | 201 | 403 | 726 | 1,260 | 1,900 | 3,410 |
| 20 | 138 | 277 | 499 | 865 | 1,310 | 2,350 |
| 30 | 111 | 222 | 401 | 695 | 1,050 | 1,880 |
| 40 | 95 | 190 | 343 | 594 | 898 | 1,610 |
| 50 | 84 | 169 | 304 | 527 | 796 | 1,430 |
| 60 | 76 | 153 | 276 | 477 | 721 | 1,300 |
| 70 | 70 | 140 | 254 | 439 | 663 | 1,190 |
| 80 | 65 | 131 | 236 | 409 | 617 | 1,110 |
| 90 | 61 | 123 | 221 | 383 | 579 | 1,040 |
| 100 | 58 | 116 | 209 | 362 | 547 | 983 |
| 125 | 51 | 103 | 185 | 321 | 485 | 871 |
| 150 | 46 | 93 | 168 | 291 | 439 | 789 |
| 175 | 43 | 86 | 154 | 268 | 404 | 726 |
| 200 | 40 | 80 | 144 | 249 | 376 | 675 |
| 250 | 35 | 71 | 127 | 221 | 333 | 598 |
| 300 | 32 | 64 | 115 | 200 | 302 | 542 |
| 350 | 29 | 59 | 106 | 184 | 278 | 499 |
| 400 | 27 | 55 | 99 | 171 | 258 | 464 |
| 450 | 26 | 51 | 93 | 160 | 242 | 435 |
| 500 | 24 | 48 | 88 | 152 | 229 | 411 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: Table entries have been rounded to three significant digits.
TABLE G2413.4(8) [402.4(22)]
POLYETHYLENE PLASTIC PIPE
| Gas | Natural |
| Inlet Pressure | 2.0 psi |
| Pressure Drop | 1.0 psi |
| Specific Gravity | 0.60 |
| PIPE SIZE (inches) | ||||||
| Nominal OD | 1/2 | 3/4 | 1 | 11/4 | 11/2 | 2 |
| Designation | SDR 9 | SDR 11 | SDR 11 | SDR 10 | SDR 11 | SDR 11 |
| Actual ID | 0.660 | 0.860 | 1.077 | 1.328 | 1.554 | 1.943 |
| Length (ft) | Capacity in Cubic Feet of Gas per Hour | |||||
| 10 | 1,860 | 3,720 | 6,710 | 11,600 | 17,600 | 31,600 |
| 20 | 1,280 | 2,560 | 4,610 | 7,990 | 12,100 | 21,700 |
| 30 | 1,030 | 2,050 | 3,710 | 6,420 | 9,690 | 17,400 |
| 40 | 878 | 1,760 | 3,170 | 5,490 | 8,300 | 14,900 |
| 50 | 778 | 1,560 | 2,810 | 4,870 | 7,350 | 13,200 |
| 60 | 705 | 1,410 | 2,550 | 4,410 | 6,660 | 12,000 |
| 70 | 649 | 1,300 | 2,340 | 4,060 | 6,130 | 11,000 |
| 80 | 603 | 1,210 | 2,180 | 3,780 | 5,700 | 10,200 |
| 90 | 566 | 1,130 | 2,050 | 3,540 | 5,350 | 9,610 |
| 100 | 535 | 1,070 | 1,930 | 3,350 | 5,050 | 9,080 |
| 125 | 474 | 949 | 1,710 | 2,970 | 4,480 | 8,050 |
| 150 | 429 | 860 | 1,550 | 2,690 | 4,060 | 7,290 |
| 175 | 395 | 791 | 1,430 | 2,470 | 3,730 | 6,710 |
| 200 | 368 | 736 | 1,330 | 2,300 | 3,470 | 6,240 |
| 250 | 326 | 652 | 1,180 | 2,040 | 3,080 | 5,530 |
| 300 | 295 | 591 | 1,070 | 1,850 | 2,790 | 5,010 |
| 350 | 272 | 544 | 981 | 1,700 | 2,570 | 4,610 |
| 400 | 253 | 506 | 913 | 1,580 | 2,390 | 4,290 |
| 450 | 237 | 475 | 856 | 1,480 | 2,240 | 4,020 |
| 500 | 224 | 448 | 809 | 1,400 | 2,120 | 3,800 |
| 550 | 213 | 426 | 768 | 1,330 | 2,010 | 3,610 |
| 600 | 203 | 406 | 733 | 1,270 | 1,920 | 3,440 |
| 650 | 194 | 389 | 702 | 1,220 | 1,840 | 3,300 |
| 700 | 187 | 374 | 674 | 1,170 | 1,760 | 3,170 |
| 750 | 180 | 360 | 649 | 1,130 | 1,700 | 3,050 |
| 800 | 174 | 348 | 627 | 1,090 | 1,640 | 2,950 |
| 850 | 168 | 336 | 607 | 1,050 | 1,590 | 2,850 |
| 900 | 163 | 326 | 588 | 1,020 | 1,540 | 2,770 |
| 950 | 158 | 317 | 572 | 990 | 1,500 | 2,690 |
| 1,000 | 154 | 308 | 556 | 963 | 1,450 | 2,610 |
| 1,100 | 146 | 293 | 528 | 915 | 1,380 | 2,480 |
| 1,200 | 139 | 279 | 504 | 873 | 1,320 | 2,370 |
| 1,300 | 134 | 267 | 482 | 836 | 1,260 | 2,270 |
| 1,400 | 128 | 257 | 463 | 803 | 1,210 | 2,180 |
| 1,500 | 124 | 247 | 446 | 773 | 1,170 | 2,100 |
| 1,600 | 119 | 239 | 431 | 747 | 1,130 | 2,030 |
| 1,700 | 115 | 231 | 417 | 723 | 1,090 | 1,960 |
| 1,800 | 112 | 224 | 404 | 701 | 1,060 | 1,900 |
| 1,900 | 109 | 218 | 393 | 680 | 1,030 | 1,850 |
| 2,000 | 106 | 212 | 382 | 662 | 1,000 | 1,800 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: Table entries have been rounded to three significant digits.
TABLE G2413.4(9) [402.4(25)]
SCHEDULE 40 METALLIC PIPE
| Gas | Undiluted Propane |
| Inlet Pressure | 10.0 psi |
| Pressure Drop | 1.0 psi |
| Specific Gravity | 1.50 |
| INTENDED USE: PIPE SIZING BETWEEN FIRST STAGE (high-pressure regulator) AND SECOND STAGE (low-pressure regulator) | |||||||||
| PIPE SIZE (inches) | |||||||||
| Nominal | 1/2 | 3/4 | 1 | 11/4 | 11/2 | 2 | 21/2 | 3 | 4 |
| Actual ID | 0.622 | 0.824 | 1.049 | 1.380 | 1.610 | 2.067 | 2.469 | 3.068 | 4.026 |
| Length (ft) | Capacity in Thousands of Btu per Hour | ||||||||
| 10 | 3,320 | 6,950 | 13,100 | 26,900 | 40,300 | 77,600 | 124,000 | 219,000 | 446,000 |
| 20 | 2,280 | 4,780 | 9,000 | 18,500 | 27,700 | 53,300 | 85,000 | 150,000 | 306,000 |
| 30 | 1,830 | 3,840 | 7,220 | 14,800 | 22,200 | 42,800 | 68,200 | 121,000 | 246,000 |
| 40 | 1,570 | 3,280 | 6,180 | 12,700 | 19,000 | 36,600 | 58,400 | 103,000 | 211,000 |
| 50 | 1,390 | 2,910 | 5,480 | 11,300 | 16,900 | 32,500 | 51,700 | 91,500 | 187,000 |
| 60 | 1,260 | 2,640 | 4,970 | 10,200 | 15,300 | 29,400 | 46,900 | 82,900 | 169,000 |
| 70 | 1,160 | 2,430 | 4,570 | 9,380 | 14,100 | 27,100 | 43,100 | 76,300 | 156,000 |
| 80 | 1,080 | 2,260 | 4,250 | 8,730 | 13,100 | 25,200 | 40,100 | 70,900 | 145,000 |
| 90 | 1,010 | 2,120 | 3,990 | 8,190 | 12,300 | 23,600 | 37,700 | 66,600 | 136,000 |
| 100 | 956 | 2,000 | 3,770 | 7,730 | 11,600 | 22,300 | 35,600 | 62,900 | 128,000 |
| 125 | 848 | 1,770 | 3,340 | 6,850 | 10,300 | 19,800 | 31,500 | 55,700 | 114,000 |
| 150 | 768 | 1,610 | 3,020 | 6,210 | 9,300 | 17,900 | 28,600 | 50,500 | 103,000 |
| 175 | 706 | 1,480 | 2,780 | 5,710 | 8,560 | 16,500 | 26,300 | 46,500 | 94,700 |
| 200 | 657 | 1,370 | 2,590 | 5,320 | 7,960 | 15,300 | 24,400 | 43,200 | 88,100 |
| 250 | 582 | 1,220 | 2,290 | 4,710 | 7,060 | 13,600 | 21,700 | 38,300 | 78,100 |
| 300 | 528 | 1,100 | 2,080 | 4,270 | 6,400 | 12,300 | 19,600 | 34,700 | 70,800 |
| 350 | 486 | 1,020 | 1,910 | 3,930 | 5,880 | 11,300 | 18,100 | 31,900 | 65,100 |
| 400 | 452 | 945 | 1,780 | 3,650 | 5,470 | 10,500 | 16,800 | 29,700 | 60,600 |
| 450 | 424 | 886 | 1,670 | 3,430 | 5,140 | 9,890 | 15,800 | 27,900 | 56,800 |
| 500 | 400 | 837 | 1,580 | 3,240 | 4,850 | 9,340 | 14,900 | 26,300 | 53,700 |
| 550 | 380 | 795 | 1,500 | 3,070 | 4,610 | 8,870 | 14,100 | 25,000 | 51,000 |
| 600 | 363 | 759 | 1,430 | 2,930 | 4,400 | 8,460 | 13,500 | 23,900 | 48,600 |
| 650 | 347 | 726 | 1,370 | 2,810 | 4,210 | 8,110 | 12,900 | 22,800 | 46,600 |
| 700 | 334 | 698 | 1,310 | 2,700 | 4,040 | 7,790 | 12,400 | 21,900 | 44,800 |
| 750 | 321 | 672 | 1,270 | 2,600 | 3,900 | 7,500 | 12,000 | 21,100 | 43,100 |
| 800 | 310 | 649 | 1,220 | 2,510 | 3,760 | 7,240 | 11,500 | 20,400 | 41,600 |
| 850 | 300 | 628 | 1,180 | 2,430 | 3,640 | 7,010 | 11,200 | 19,800 | 40,300 |
| 900 | 291 | 609 | 1,150 | 2,360 | 3,530 | 6,800 | 10,800 | 19,200 | 39,100 |
| 950 | 283 | 592 | 1,110 | 2,290 | 3,430 | 6,600 | 10,500 | 18,600 | 37,900 |
| 1,000 | 275 | 575 | 1,080 | 2,230 | 3,330 | 6,420 | 10,200 | 18,100 | 36,900 |
| 1,100 | 261 | 546 | 1,030 | 2,110 | 3,170 | 6,100 | 9,720 | 17,200 | 35,000 |
| 1,200 | 249 | 521 | 982 | 2,020 | 3,020 | 5,820 | 9,270 | 16,400 | 33,400 |
| 1,300 | 239 | 499 | 940 | 1,930 | 2,890 | 5,570 | 8,880 | 15,700 | 32,000 |
| 1,400 | 229 | 480 | 903 | 1,850 | 2,780 | 5,350 | 8,530 | 15,100 | 30,800 |
| 1,500 | 221 | 462 | 870 | 1,790 | 2,680 | 5,160 | 8,220 | 14,500 | 29,600 |
| 1,600 | 213 | 446 | 840 | 1,730 | 2,590 | 4,980 | 7,940 | 14,000 | 28,600 |
| 1,700 | 206 | 432 | 813 | 1,670 | 2,500 | 4,820 | 7,680 | 13,600 | 27,700 |
| 1,800 | 200 | 419 | 789 | 1,620 | 2,430 | 4,670 | 7,450 | 13,200 | 26,900 |
| 1,900 | 194 | 407 | 766 | 1,570 | 2,360 | 4,540 | 7,230 | 12,800 | 26,100 |
| 2,000 | 189 | 395 | 745 | 1,530 | 2,290 | 4,410 | 7,030 | 12,400 | 25,400 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: Table entries have been rounded to three significant digits.
TABLE G2413.4(10) [402.4(26)]
SCHEDULE 40 METALLIC PIPE
| Gas | Undiluted Propane |
| Inlet Pressure | 10.0 psi |
| Pressure Drop | 3.0 psi |
| Specific Gravity | 1.50 |
| INTENDED USE: PIPE SIZING BETWEEN FIRST STAGE (high-pressure regulator) AND SECOND STAGE (low-pressure regulator) | |||||||||
| PIPE SIZE (inches) | |||||||||
| Nominal | 1/2 | 3/4 | 1 | 11/4 | 11/2 | 2 | 21/2 | 3 | 4 |
| Actual ID | 0.622 | 0.824 | 1.049 | 1.380 | 1.610 | 2.067 | 2.469 | 3.068 | 4.026 |
| Length (ft) | Capacity in Thousands of Btu per Hour | ||||||||
| 10 | 5,890 | 12,300 | 23,200 | 47,600 | 71,300 | 137,000 | 219,000 | 387,000 | 789,000 |
| 20 | 4,050 | 8,460 | 15,900 | 32,700 | 49,000 | 94,400 | 150,000 | 266,000 | 543,000 |
| 30 | 3,250 | 6,790 | 12,800 | 26,300 | 39,400 | 75,800 | 121,000 | 214,000 | 436,000 |
| 40 | 2,780 | 5,810 | 11,000 | 22,500 | 33,700 | 64,900 | 103,000 | 183,000 | 373,000 |
| 50 | 2,460 | 5,150 | 9,710 | 19,900 | 29,900 | 57,500 | 91,600 | 162,000 | 330,000 |
| 60 | 2,230 | 4,670 | 8,790 | 18,100 | 27,100 | 52,100 | 83,000 | 147,000 | 299,000 |
| 70 | 2,050 | 4,300 | 8,090 | 16,600 | 24,900 | 47,900 | 76,400 | 135,000 | 275,000 |
| 80 | 1,910 | 4,000 | 7,530 | 15,500 | 23,200 | 44,600 | 71,100 | 126,000 | 256,000 |
| 90 | 1,790 | 3,750 | 7,060 | 14,500 | 21,700 | 41,800 | 66,700 | 118,000 | 240,000 |
| 100 | 1,690 | 3,540 | 6,670 | 13,700 | 20,500 | 39,500 | 63,000 | 111,000 | 227,000 |
| 125 | 1,500 | 3,140 | 5,910 | 12,100 | 18,200 | 35,000 | 55,800 | 98,700 | 201,000 |
| 150 | 1,360 | 2,840 | 5,360 | 11,000 | 16,500 | 31,700 | 50,600 | 89,400 | 182,000 |
| 175 | 1,250 | 2,620 | 4,930 | 10,100 | 15,200 | 29,200 | 46,500 | 82,300 | 167,800 |
| 200 | 1,160 | 2,430 | 4,580 | 9,410 | 14,100 | 27,200 | 43,300 | 76,500 | 156,100 |
| 250 | 1,030 | 2,160 | 4,060 | 8,340 | 12,500 | 24,100 | 38,400 | 67,800 | 138,400 |
| 300 | 935 | 1,950 | 3,680 | 7,560 | 11,300 | 21,800 | 34,800 | 61,500 | 125,400 |
| 350 | 860 | 1,800 | 3,390 | 6,950 | 10,400 | 20,100 | 32,000 | 56,500 | 115,300 |
| 400 | 800 | 1,670 | 3,150 | 6,470 | 9,690 | 18,700 | 29,800 | 52,600 | 107,300 |
| 450 | 751 | 1,570 | 2,960 | 6,070 | 9,090 | 17,500 | 27,900 | 49,400 | 100,700 |
| 500 | 709 | 1,480 | 2,790 | 5,730 | 8,590 | 16,500 | 26,400 | 46,600 | 95,100 |
| 550 | 673 | 1,410 | 2,650 | 5,450 | 8,160 | 15,700 | 25,000 | 44,300 | 90,300 |
| 600 | 642 | 1,340 | 2,530 | 5,200 | 7,780 | 15,000 | 23,900 | 42,200 | 86,200 |
| 650 | 615 | 1,290 | 2,420 | 4,980 | 7,450 | 14,400 | 22,900 | 40,500 | 82,500 |
| 700 | 591 | 1,240 | 2,330 | 4,780 | 7,160 | 13,800 | 22,000 | 38,900 | 79,300 |
| 750 | 569 | 1,190 | 2,240 | 4,600 | 6,900 | 13,300 | 21,200 | 37,400 | 76,400 |
| 800 | 550 | 1,150 | 2,170 | 4,450 | 6,660 | 12,800 | 20,500 | 36,200 | 73,700 |
| 850 | 532 | 1,110 | 2,100 | 4,300 | 6,450 | 12,400 | 19,800 | 35,000 | 71,400 |
| 900 | 516 | 1,080 | 2,030 | 4,170 | 6,250 | 12,000 | 19,200 | 33,900 | 69,200 |
| 950 | 501 | 1,050 | 1,970 | 4,050 | 6,070 | 11,700 | 18,600 | 32,900 | 67,200 |
| 1,000 | 487 | 1,020 | 1,920 | 3,940 | 5,900 | 11,400 | 18,100 | 32,000 | 65,400 |
| 1,100 | 463 | 968 | 1,820 | 3,740 | 5,610 | 10,800 | 17,200 | 30,400 | 62,100 |
| 1,200 | 442 | 923 | 1,740 | 3,570 | 5,350 | 10,300 | 16,400 | 29,000 | 59,200 |
| 1,300 | 423 | 884 | 1,670 | 3,420 | 5,120 | 9,870 | 15,700 | 27,800 | 56,700 |
| 1,400 | 406 | 849 | 1,600 | 3,280 | 4,920 | 9,480 | 15,100 | 26,700 | 54,500 |
| 1,500 | 391 | 818 | 1,540 | 3,160 | 4,740 | 9,130 | 14,600 | 25,700 | 52,500 |
| 1,600 | 378 | 790 | 1,490 | 3,060 | 4,580 | 8,820 | 14,100 | 24,800 | 50,700 |
| 1,700 | 366 | 765 | 1,440 | 2,960 | 4,430 | 8,530 | 13,600 | 24,000 | 49,000 |
| 1,800 | 355 | 741 | 1,400 | 2,870 | 4,300 | 8,270 | 13,200 | 23,300 | 47,600 |
| 1,900 | 344 | 720 | 1,360 | 2,780 | 4,170 | 8,040 | 12,800 | 22,600 | 46,200 |
| 2,000 | 335 | 700 | 1,320 | 2,710 | 4,060 | 7,820 | 12,500 | 22,000 | 44,900 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: Table entries have been rounded to three significant digits.
TABLE G2413.4(11) [402.4(27)]
SCHEDULE 40 METALLIC PIPE
| Gas | Undiluted Propane |
| Inlet Pressure | 2.0 psi |
| Pressure Drop | 1.0 psi |
| Specific Gravity | 1.50 |
| INTENDED USE: PIPE SIZING BETWEEN 2 PSIG SERVICE AND LINE PRESSURE REGULATOR | |||||||||
| PIPE SIZE (inches) | |||||||||
| Nominal | 1/2 | 3/4 | 1 | 11/4 | 11/2 | 2 | 21/2 | 3 | 4 |
| Actual ID | 0.622 | 0.824 | 1.049 | 1.380 | 1.610 | 2.067 | 2.469 | 3.068 | 4.026 |
| Length (ft) | Capacity in Thousands of Btu per Hour | ||||||||
| 10 | 2,680 | 5,590 | 10,500 | 21,600 | 32,400 | 62,400 | 99,500 | 176,000 | 359,000 |
| 20 | 1,840 | 3,850 | 7,240 | 14,900 | 22,300 | 42,900 | 68,400 | 121,000 | 247,000 |
| 30 | 1,480 | 3,090 | 5,820 | 11,900 | 17,900 | 34,500 | 54,900 | 97,100 | 198,000 |
| 40 | 1,260 | 2,640 | 4,980 | 10,200 | 15,300 | 29,500 | 47,000 | 83,100 | 170,000 |
| 50 | 1,120 | 2,340 | 4,410 | 9,060 | 13,600 | 26,100 | 41,700 | 73,700 | 150,000 |
| 60 | 1,010 | 2,120 | 4,000 | 8,210 | 12,300 | 23,700 | 37,700 | 66,700 | 136,000 |
| 70 | 934 | 1,950 | 3,680 | 7,550 | 11,300 | 21,800 | 34,700 | 61,400 | 125,000 |
| 80 | 869 | 1,820 | 3,420 | 7,020 | 10,500 | 20,300 | 32,300 | 57,100 | 116,000 |
| 90 | 815 | 1,700 | 3,210 | 6,590 | 9,880 | 19,000 | 30,300 | 53,600 | 109,000 |
| 100 | 770 | 1,610 | 3,030 | 6,230 | 9,330 | 18,000 | 28,600 | 50,600 | 103,000 |
| 125 | 682 | 1,430 | 2,690 | 5,520 | 8,270 | 15,900 | 25,400 | 44,900 | 91,500 |
| 150 | 618 | 1,290 | 2,440 | 5,000 | 7,490 | 14,400 | 23,000 | 40,700 | 82,900 |
| 175 | 569 | 1,190 | 2,240 | 4,600 | 6,890 | 13,300 | 21,200 | 37,400 | 76,300 |
| 200 | 529 | 1,110 | 2,080 | 4,280 | 6,410 | 12,300 | 19,700 | 34,800 | 71,000 |
| 250 | 469 | 981 | 1,850 | 3,790 | 5,680 | 10,900 | 17,400 | 30,800 | 62,900 |
| 300 | 425 | 889 | 1,670 | 3,440 | 5,150 | 9,920 | 15,800 | 27,900 | 57,000 |
| 350 | 391 | 817 | 1,540 | 3,160 | 4,740 | 9,120 | 14,500 | 25,700 | 52,400 |
| 400 | 364 | 760 | 1,430 | 2,940 | 4,410 | 8,490 | 13,500 | 23,900 | 48,800 |
| 450 | 341 | 714 | 1,340 | 2,760 | 4,130 | 7,960 | 12,700 | 22,400 | 45,800 |
| 500 | 322 | 674 | 1,270 | 2,610 | 3,910 | 7,520 | 12,000 | 21,200 | 43,200 |
| 550 | 306 | 640 | 1,210 | 2,480 | 3,710 | 7,140 | 11,400 | 20,100 | 41,100 |
| 600 | 292 | 611 | 1,150 | 2,360 | 3,540 | 6,820 | 10,900 | 19,200 | 39,200 |
| 650 | 280 | 585 | 1,100 | 2,260 | 3,390 | 6,530 | 10,400 | 18,400 | 37,500 |
| 700 | 269 | 562 | 1,060 | 2,170 | 3,260 | 6,270 | 9,990 | 17,700 | 36,000 |
| 750 | 259 | 541 | 1,020 | 2,090 | 3,140 | 6,040 | 9,630 | 17,000 | 34,700 |
| 800 | 250 | 523 | 985 | 2,020 | 3,030 | 5,830 | 9,300 | 16,400 | 33,500 |
| 850 | 242 | 506 | 953 | 1,960 | 2,930 | 5,640 | 9,000 | 15,900 | 32,400 |
| 900 | 235 | 490 | 924 | 1,900 | 2,840 | 5,470 | 8,720 | 15,400 | 31,500 |
| 950 | 228 | 476 | 897 | 1,840 | 2,760 | 5,310 | 8,470 | 15,000 | 30,500 |
| 1,000 | 222 | 463 | 873 | 1,790 | 2,680 | 5,170 | 8,240 | 14,600 | 29,700 |
| 1,100 | 210 | 440 | 829 | 1,700 | 2,550 | 4,910 | 7,830 | 13,800 | 28,200 |
| 1,200 | 201 | 420 | 791 | 1,620 | 2,430 | 4,680 | 7,470 | 13,200 | 26,900 |
| 1,300 | 192 | 402 | 757 | 1,550 | 2,330 | 4,490 | 7,150 | 12,600 | 25,800 |
| 1,400 | 185 | 386 | 727 | 1,490 | 2,240 | 4,310 | 6,870 | 12,100 | 24,800 |
| 1,500 | 178 | 372 | 701 | 1,440 | 2,160 | 4,150 | 6,620 | 11,700 | 23,900 |
| 1,600 | 172 | 359 | 677 | 1,390 | 2,080 | 4,010 | 6,390 | 11,300 | 23,000 |
| 1,700 | 166 | 348 | 655 | 1,340 | 2,010 | 3,880 | 6,180 | 10,900 | 22,300 |
| 1,800 | 161 | 337 | 635 | 1,300 | 1,950 | 3,760 | 6,000 | 10,600 | 21,600 |
| 1,900 | 157 | 327 | 617 | 1,270 | 1,900 | 3,650 | 5,820 | 10,300 | 21,000 |
| 2,000 | 152 | 318 | 600 | 1,230 | 1,840 | 3,550 | 5,660 | 10,000 | 20,400 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: Table entries have been rounded to three significant digits.
TABLE G2413.4(12) [402.4(28)]
SCHEDULE 40 METALLIC PIPE
| Gas | Undiluted Propane |
| Inlet Pressure | 11.0 in. w.c. |
| Pressure Drop | 0.5 in. w.c. |
| Specific Gravity | 1.50 |
| INTENDED USE: PIPE SIZING BETWEEN SINGLE- OR SECOND-STAGE (low pressure) REGULATOR AND APPLIANCE | |||||||||
| PIPE SIZE (inches) | |||||||||
| Nominal | 1/2 | 3/4 | 1 | 11/4 | 11/2 | 2 | 21/2 | 3 | 4 |
| Actual ID | 0.622 | 0.824 | 1.049 | 1.380 | 1.610 | 2.067 | 2.469 | 3.068 | 4.026 |
| Length (ft) | Capacity in Thousands of Btu per Hour | ||||||||
| 10 | 291 | 608 | 1,150 | 2,350 | 3,520 | 6,790 | 10,800 | 19,100 | 39,000 |
| 20 | 200 | 418 | 787 | 1,620 | 2,420 | 4,660 | 7,430 | 13,100 | 26,800 |
| 30 | 160 | 336 | 632 | 1,300 | 1,940 | 3,750 | 5,970 | 10,600 | 21,500 |
| 40 | 137 | 287 | 541 | 1,110 | 1,660 | 3,210 | 5,110 | 9,030 | 18,400 |
| 50 | 122 | 255 | 480 | 985 | 1,480 | 2,840 | 4,530 | 8,000 | 16,300 |
| 60 | 110 | 231 | 434 | 892 | 1,340 | 2,570 | 4,100 | 7,250 | 14,800 |
| 80 | 101 | 212 | 400 | 821 | 1,230 | 2,370 | 3,770 | 6,670 | 13,600 |
| 100 | 94 | 197 | 372 | 763 | 1,140 | 2,200 | 3,510 | 6,210 | 12,700 |
| 125 | 89 | 185 | 349 | 716 | 1,070 | 2,070 | 3,290 | 5,820 | 11,900 |
| 150 | 84 | 175 | 330 | 677 | 1,010 | 1,950 | 3,110 | 5,500 | 11,200 |
| 175 | 74 | 155 | 292 | 600 | 899 | 1,730 | 2,760 | 4,880 | 9,950 |
| 200 | 67 | 140 | 265 | 543 | 814 | 1,570 | 2,500 | 4,420 | 9,010 |
| 250 | 62 | 129 | 243 | 500 | 749 | 1,440 | 2,300 | 4,060 | 8,290 |
| 300 | 58 | 120 | 227 | 465 | 697 | 1,340 | 2,140 | 3,780 | 7,710 |
| 350 | 51 | 107 | 201 | 412 | 618 | 1,190 | 1,900 | 3,350 | 6,840 |
| 400 | 46 | 97 | 182 | 373 | 560 | 1,080 | 1,720 | 3,040 | 6,190 |
| 450 | 42 | 89 | 167 | 344 | 515 | 991 | 1,580 | 2,790 | 5,700 |
| 500 | 40 | 83 | 156 | 320 | 479 | 922 | 1,470 | 2,600 | 5,300 |
| 550 | 37 | 78 | 146 | 300 | 449 | 865 | 1,380 | 2,440 | 4,970 |
| 600 | 35 | 73 | 138 | 283 | 424 | 817 | 1,300 | 2,300 | 4,700 |
| 650 | 33 | 70 | 131 | 269 | 403 | 776 | 1,240 | 2,190 | 4,460 |
| 700 | 32 | 66 | 125 | 257 | 385 | 741 | 1,180 | 2,090 | 4,260 |
| 750 | 30 | 64 | 120 | 246 | 368 | 709 | 1,130 | 2,000 | 4,080 |
| 800 | 29 | 61 | 115 | 236 | 354 | 681 | 1,090 | 1,920 | 3,920 |
| 850 | 28 | 59 | 111 | 227 | 341 | 656 | 1,050 | 1,850 | 3,770 |
| 900 | 27 | 57 | 107 | 220 | 329 | 634 | 1,010 | 1,790 | 3,640 |
| 950 | 26 | 55 | 104 | 213 | 319 | 613 | 978 | 1,730 | 3,530 |
| 1,000 | 25 | 53 | 100 | 206 | 309 | 595 | 948 | 1,680 | 3,420 |
| 1,100 | 25 | 52 | 97 | 200 | 300 | 578 | 921 | 1,630 | 3,320 |
| 1,200 | 24 | 50 | 95 | 195 | 292 | 562 | 895 | 1,580 | 3,230 |
| 1,300 | 23 | 48 | 90 | 185 | 277 | 534 | 850 | 1,500 | 3,070 |
| 1,400 | 22 | 46 | 86 | 176 | 264 | 509 | 811 | 1,430 | 2,930 |
| 1,500 | 21 | 44 | 82 | 169 | 253 | 487 | 777 | 1,370 | 2,800 |
| 1,200 | 24 | 50 | 95 | 195 | 292 | 562 | 895 | 1,580 | 3,230 |
| 1,300 | 23 | 48 | 90 | 185 | 277 | 534 | 850 | 1,500 | 3,070 |
| 1,400 | 22 | 46 | 86 | 176 | 264 | 509 | 811 | 1,430 | 2,930 |
| 1,500 | 21 | 44 | 82 | 169 | 253 | 487 | 777 | 1,370 | 2,800 |
| 1,600 | 20 | 42 | 79 | 162 | 243 | 468 | 746 | 1,320 | 2,690 |
| 1,700 | 19 | 40 | 76 | 156 | 234 | 451 | 719 | 1,270 | 2,590 |
| 1,800 | 19 | 39 | 74 | 151 | 226 | 436 | 694 | 1,230 | 2,500 |
| 1,900 | 18 | 38 | 71 | 146 | 219 | 422 | 672 | 1,190 | 2,420 |
| 2,000 | 18 | 37 | 69 | 142 | 212 | 409 | 652 | 1,150 | 2,350 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: Table entries have been rounded to three significant digits.
TABLE G2413.4(13) [402.4(29)]
SEMIRIGID COPPER TUBING
| Gas | Undiluted Propane |
| Inlet Pressure | 10.0 psi |
| Pressure Drop | 1.0 psi |
| Specific Gravity | 1.50 |
| INTENDED USE: SIZING BETWEEN FIRST STAGE (high-pressure regulator) AND SECOND STAGE (low-pressure regulator) | ||||||||||
| TUBE SIZE (inches) | ||||||||||
| Nominal | K & L | 1/4 | 3/8 | 1/2 | 5/8 | 3/4 | 1 | 11/4 | 11/2 | 2 |
| ACR | 3/8 | 1/2 | 5/8 | 3/4 | 7/8 | 11/8 | 13/8 | — | — | |
| Outside | 0.375 | 0.500 | 0.625 | 0.750 | 0.875 | 1.125 | 1.375 | 1.625 | 2.125 | |
| Inside | 0.305 | 0.402 | 0.527 | 0.652 | 0.745 | 0.995 | 1.245 | 1.481 | 1.959 | |
| Length (ft) | Capacity in Thousands of Btu per Hour | |||||||||
| 10 | 513 | 1,060 | 2,150 | 3,760 | 5,330 | 11,400 | 20,500 | 32,300 | 67,400 | |
| 20 | 352 | 727 | 1,480 | 2,580 | 3,670 | 7,830 | 14,100 | 22,200 | 46,300 | |
| 30 | 283 | 584 | 1,190 | 2,080 | 2,940 | 6,290 | 11,300 | 17,900 | 37,200 | |
| 40 | 242 | 500 | 1,020 | 1,780 | 2,520 | 5,380 | 9,690 | 15,300 | 31,800 | |
| 50 | 215 | 443 | 901 | 1,570 | 2,230 | 4,770 | 8,590 | 13,500 | 28,200 | |
| 60 | 194 | 401 | 816 | 1,430 | 2,020 | 4,320 | 7,780 | 12,300 | 25,600 | |
| 70 | 179 | 369 | 751 | 1,310 | 1,860 | 3,980 | 7,160 | 11,300 | 23,500 | |
| 80 | 166 | 343 | 699 | 1,220 | 1,730 | 3,700 | 6,660 | 10,500 | 21,900 | |
| 90 | 156 | 322 | 655 | 1,150 | 1,630 | 3,470 | 6,250 | 9,850 | 20,500 | |
| 100 | 147 | 304 | 619 | 1,080 | 1,540 | 3,280 | 5,900 | 9,310 | 19,400 | |
| 125 | 131 | 270 | 549 | 959 | 1,360 | 2,910 | 5,230 | 8,250 | 17,200 | |
| 150 | 118 | 244 | 497 | 869 | 1,230 | 2,630 | 4,740 | 7,470 | 15,600 | |
| 175 | 109 | 225 | 457 | 799 | 1,130 | 2,420 | 4,360 | 6,880 | 14,300 | |
| 200 | 101 | 209 | 426 | 744 | 1,060 | 2,250 | 4,060 | 6,400 | 13,300 | |
| 250 | 90 | 185 | 377 | 659 | 935 | 2,000 | 3,600 | 5,670 | 11,800 | |
| 300 | 81 | 168 | 342 | 597 | 847 | 1,810 | 3,260 | 5,140 | 10,700 | |
| 350 | 75 | 155 | 314 | 549 | 779 | 1,660 | 3,000 | 4,730 | 9,840 | |
| 400 | 70 | 144 | 292 | 511 | 725 | 1,550 | 2,790 | 4,400 | 9,160 | |
| 450 | 65 | 135 | 274 | 480 | 680 | 1,450 | 2,620 | 4,130 | 8,590 | |
| 500 | 62 | 127 | 259 | 453 | 643 | 1,370 | 2,470 | 3,900 | 8,120 | |
| 550 | 59 | 121 | 246 | 430 | 610 | 1,300 | 2,350 | 3,700 | 7,710 | |
| 600 | 56 | 115 | 235 | 410 | 582 | 1,240 | 2,240 | 3,530 | 7,350 | |
| 650 | 54 | 111 | 225 | 393 | 558 | 1,190 | 2,140 | 3,380 | 7,040 | |
| 700 | 51 | 106 | 216 | 378 | 536 | 1,140 | 2,060 | 3,250 | 6,770 | |
| 750 | 50 | 102 | 208 | 364 | 516 | 1,100 | 1,980 | 3,130 | 6,520 | |
| 800 | 48 | 99 | 201 | 351 | 498 | 1,060 | 1,920 | 3,020 | 6,290 | |
| 850 | 46 | 96 | 195 | 340 | 482 | 1,030 | 1,850 | 2,920 | 6,090 | |
| 900 | 45 | 93 | 189 | 330 | 468 | 1,000 | 1,800 | 2,840 | 5,910 | |
| 950 | 44 | 90 | 183 | 320 | 454 | 970 | 1,750 | 2,750 | 5,730 | |
| 1,000 | 42 | 88 | 178 | 311 | 442 | 944 | 1,700 | 2,680 | 5,580 | |
| 1,100 | 40 | 83 | 169 | 296 | 420 | 896 | 1,610 | 2,540 | 5,300 | |
| 1,200 | 38 | 79 | 161 | 282 | 400 | 855 | 1,540 | 2,430 | 5,050 | |
| 1,300 | 37 | 76 | 155 | 270 | 383 | 819 | 1,470 | 2,320 | 4,840 | |
| 1,400 | 35 | 73 | 148 | 260 | 368 | 787 | 1,420 | 2,230 | 4,650 | |
| 1,500 | 34 | 70 | 143 | 250 | 355 | 758 | 1,360 | 2,150 | 4,480 | |
| 1,600 | 33 | 68 | 138 | 241 | 343 | 732 | 1,320 | 2,080 | 4,330 | |
| 1,700 | 32 | 66 | 134 | 234 | 331 | 708 | 1,270 | 2,010 | 4,190 | |
| 1,800 | 31 | 64 | 130 | 227 | 321 | 687 | 1,240 | 1,950 | 4,060 | |
| 1,900 | 30 | 62 | 126 | 220 | 312 | 667 | 1,200 | 1,890 | 3,940 | |
| 2,000 | 29 | 60 | 122 | 214 | 304 | 648 | 1,170 | 1,840 | 3,830 | |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
TABLE G2413.4(14) [402.4(30)]
SEMIRIGID COPPER TUBING
| Gas | Undiluted Propane |
| Inlet Pressure | 11.0 in. w.c. |
| Pressure Drop | 0.5 in. w.c. |
| Specific Gravity | 1.50 |
| INTENDED USE: SIZING BETWEEN SINGLE- OR SECOND-STAGE (low-pressure regulator) AND APPLIANCE | ||||||||||
| TUBE SIZE (inches) | ||||||||||
| Nominal | K & L | 1/4 | 3/8 | 1/2 | 5/8 | 3/4 | 1 | 11/4 | 11/2 | 2 |
| ACR | 3/8 | 1/2 | 5/8 | 3/4 | 7/8 | 11/8 | 13/8 | — | — | |
| Outside | 0.375 | 0.500 | 0.625 | 0.750 | 0.875 | 1.125 | 1.375 | 1.625 | 2.125 | |
| Inside | 0.305 | 0.402 | 0.527 | 0.652 | 0.745 | 0.995 | 1.245 | 1.481 | 1.959 | |
| Length (ft) | Capacity in Thousands of Btu per Hour | |||||||||
| 10 | 45 | 93 | 188 | 329 | 467 | 997 | 1,800 | 2,830 | 5,890 | |
| 20 | 31 | 64 | 129 | 226 | 321 | 685 | 1,230 | 1,950 | 4,050 | |
| 30 | 25 | 51 | 104 | 182 | 258 | 550 | 991 | 1,560 | 3,250 | |
| 40 | 21 | 44 | 89 | 155 | 220 | 471 | 848 | 1,340 | 2,780 | |
| 50 | 19 | 39 | 79 | 138 | 195 | 417 | 752 | 1,180 | 2,470 | |
| 60 | 17 | 35 | 71 | 125 | 177 | 378 | 681 | 1,070 | 2,240 | |
| 70 | 16 | 32 | 66 | 115 | 163 | 348 | 626 | 988 | 2,060 | |
| 80 | 15 | 30 | 61 | 107 | 152 | 324 | 583 | 919 | 1,910 | |
| 90 | 14 | 28 | 57 | 100 | 142 | 304 | 547 | 862 | 1,800 | |
| 100 | 13 | 27 | 54 | 95 | 134 | 287 | 517 | 814 | 1,700 | |
| 125 | 11 | 24 | 48 | 84 | 119 | 254 | 458 | 722 | 1,500 | |
| 150 | 10 | 21 | 44 | 76 | 108 | 230 | 415 | 654 | 1,360 | |
| 175 | NA | 20 | 40 | 70 | 99 | 212 | 382 | 602 | 1,250 | |
| 200 | NA | 18 | 37 | 65 | 92 | 197 | 355 | 560 | 1,170 | |
| 250 | NA | 16 | 33 | 58 | 82 | 175 | 315 | 496 | 1,030 | |
| 300 | NA | 15 | 30 | 52 | 74 | 158 | 285 | 449 | 936 | |
| 350 | NA | 14 | 28 | 48 | 68 | 146 | 262 | 414 | 861 | |
| 400 | NA | 13 | 26 | 45 | 63 | 136 | 244 | 385 | 801 | |
| 450 | NA | 12 | 24 | 42 | 60 | 127 | 229 | 361 | 752 | |
| 500 | NA | 11 | 23 | 40 | 56 | 120 | 216 | 341 | 710 | |
| 550 | NA | 11 | 22 | 38 | 53 | 114 | 205 | 324 | 674 | |
| 600 | NA | 10 | 21 | 36 | 51 | 109 | 196 | 309 | 643 | |
| 650 | NA | NA | 20 | 34 | 49 | 104 | 188 | 296 | 616 | |
| 700 | NA | NA | 19 | 33 | 47 | 100 | 180 | 284 | 592 | |
| 750 | NA | NA | 18 | 32 | 45 | 96 | 174 | 274 | 570 | |
| 800 | NA | NA | 18 | 31 | 44 | 93 | 168 | 264 | 551 | |
| 850 | NA | NA | 17 | 30 | 42 | 90 | 162 | 256 | 533 | |
| 900 | NA | NA | 17 | 29 | 41 | 87 | 157 | 248 | 517 | |
| 950 | NA | NA | 16 | 28 | 40 | 85 | 153 | 241 | 502 | |
| 1,000 | NA | NA | 16 | 27 | 39 | 83 | 149 | 234 | 488 | |
| 1,100 | NA | NA | 15 | 26 | 37 | 78 | 141 | 223 | 464 | |
| 1,200 | NA | NA | 14 | 25 | 35 | 75 | 135 | 212 | 442 | |
| 1,300 | NA | NA | 14 | 24 | 34 | 72 | 129 | 203 | 423 | |
| 1,400 | NA | NA | 13 | 23 | 32 | 69 | 124 | 195 | 407 | |
| 1,500 | NA | NA | 13 | 22 | 31 | 66 | 119 | 188 | 392 | |
| 1,600 | NA | NA | 12 | 21 | 30 | 64 | 115 | 182 | 378 | |
| 1,700 | NA | NA | 12 | 20 | 29 | 62 | 112 | 176 | 366 | |
| 1,800 | NA | NA | 11 | 20 | 28 | 60 | 108 | 170 | 355 | |
| 1,900 | NA | NA | 11 | 19 | 27 | 58 | 105 | 166 | 345 | |
| 2,000 | NA | NA | 11 | 19 | 27 | 57 | 102 | 161 | 335 | |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
TABLE G2413.4(15) [402.4(31)]
SEMIRIGID COPPER TUBING
| Gas | Undiluted Propane |
| Inlet Pressure | 2.0 psi |
| Pressure Drop | 1.0 psi |
| Specific Gravity | 1.50 |
| INTENDED USE: TUBE SIZING BETWEEN 2 PSIG SERVICE AND LINE PRESSURE REGULATOR | ||||||||||
| TUBE SIZE (inches) | ||||||||||
| Nominal | K & L | 1/4 | 3/8 | 1/2 | 5/8 | 3/4 | 1 | 11/4 | 11/2 | 2 |
| ACR | 3/8 | 1/2 | 5/8 | 3/4 | 7/8 | 11/8 | 13/8 | — | — | |
| Outside | 0.375 | 0.500 | 0.625 | 0.750 | 0.875 | 1.125 | 1.375 | 1.625 | 2.125 | |
| Inside | 0.305 | 0.402 | 0.527 | 0.652 | 0.745 | 0.995 | 1.245 | 1.481 | 1.959 | |
| Length (ft) | Capacity in Thousands of Btu per Hour | |||||||||
| 10 | 413 | 852 | 1,730 | 3,030 | 4,300 | 9,170 | 16,500 | 26,000 | 54,200 | |
| 20 | 284 | 585 | 1,190 | 2,080 | 2,950 | 6,310 | 11,400 | 17,900 | 37,300 | |
| 30 | 228 | 470 | 956 | 1,670 | 2,370 | 5,060 | 9,120 | 14,400 | 29,900 | |
| 40 | 195 | 402 | 818 | 1,430 | 2,030 | 4,330 | 7,800 | 12,300 | 25,600 | |
| 50 | 173 | 356 | 725 | 1,270 | 1,800 | 3,840 | 6,920 | 10,900 | 22,700 | |
| 60 | 157 | 323 | 657 | 1,150 | 1,630 | 3,480 | 6,270 | 9,880 | 20,600 | |
| 70 | 144 | 297 | 605 | 1,060 | 1,500 | 3,200 | 5,760 | 9,090 | 18,900 | |
| 80 | 134 | 276 | 562 | 983 | 1,390 | 2,980 | 5,360 | 8,450 | 17,600 | |
| 90 | 126 | 259 | 528 | 922 | 1,310 | 2,790 | 5,030 | 7,930 | 16,500 | |
| 100 | 119 | 245 | 498 | 871 | 1,240 | 2,640 | 4,750 | 7,490 | 15,600 | |
| 125 | 105 | 217 | 442 | 772 | 1,100 | 2,340 | 4,210 | 6,640 | 13,800 | |
| 150 | 95 | 197 | 400 | 700 | 992 | 2,120 | 3,820 | 6,020 | 12,500 | |
| 175 | 88 | 181 | 368 | 644 | 913 | 1,950 | 3,510 | 5,540 | 11,500 | |
| 200 | 82 | 168 | 343 | 599 | 849 | 1,810 | 3,270 | 5,150 | 10,700 | |
| 250 | 72 | 149 | 304 | 531 | 753 | 1,610 | 2,900 | 4,560 | 9,510 | |
| 300 | 66 | 135 | 275 | 481 | 682 | 1,460 | 2,620 | 4,140 | 8,610 | |
| 350 | 60 | 124 | 253 | 442 | 628 | 1,340 | 2,410 | 3,800 | 7,920 | |
| 400 | 56 | 116 | 235 | 411 | 584 | 1,250 | 2,250 | 3,540 | 7,370 | |
| 450 | 53 | 109 | 221 | 386 | 548 | 1,170 | 2,110 | 3,320 | 6,920 | |
| 500 | 50 | 103 | 209 | 365 | 517 | 1,110 | 1,990 | 3,140 | 6,530 | |
| 550 | 47 | 97 | 198 | 346 | 491 | 1,050 | 1,890 | 2,980 | 6,210 | |
| 600 | 45 | 93 | 189 | 330 | 469 | 1,000 | 1,800 | 2,840 | 5,920 | |
| 650 | 43 | 89 | 181 | 316 | 449 | 959 | 1,730 | 2,720 | 5,670 | |
| 700 | 41 | 86 | 174 | 304 | 431 | 921 | 1,660 | 2,620 | 5,450 | |
| 750 | 40 | 82 | 168 | 293 | 415 | 888 | 1,600 | 2,520 | 5,250 | |
| 800 | 39 | 80 | 162 | 283 | 401 | 857 | 1,540 | 2,430 | 5,070 | |
| 850 | 37 | 77 | 157 | 274 | 388 | 829 | 1,490 | 2,350 | 4,900 | |
| 900 | 36 | 75 | 152 | 265 | 376 | 804 | 1,450 | 2,280 | 4,750 | |
| 950 | 35 | 72 | 147 | 258 | 366 | 781 | 1,410 | 2,220 | 4,620 | |
| 1,000 | 34 | 71 | 143 | 251 | 356 | 760 | 1,370 | 2,160 | 4,490 | |
| 1,100 | 32 | 67 | 136 | 238 | 338 | 721 | 1,300 | 2,050 | 4,270 | |
| 1,200 | 31 | 64 | 130 | 227 | 322 | 688 | 1,240 | 1,950 | 4,070 | |
| 1,300 | 30 | 61 | 124 | 217 | 309 | 659 | 1,190 | 1,870 | 3,900 | |
| 1,400 | 28 | 59 | 120 | 209 | 296 | 633 | 1,140 | 1,800 | 3,740 | |
| 1,500 | 27 | 57 | 115 | 201 | 286 | 610 | 1,100 | 1,730 | 3,610 | |
| 1,600 | 26 | 55 | 111 | 194 | 276 | 589 | 1,060 | 1,670 | 3,480 | |
| 1,700 | 26 | 53 | 108 | 188 | 267 | 570 | 1,030 | 1,620 | 3,370 | |
| 1,800 | 25 | 51 | 104 | 182 | 259 | 553 | 1,000 | 1,570 | 3,270 | |
| 1,900 | 24 | 50 | 101 | 177 | 251 | 537 | 966 | 1,520 | 3,170 | |
| 2,000 | 23 | 48 | 99 | 172 | 244 | 522 | 940 | 1,480 | 3,090 | |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
TABLE G2413.4(16) [402.4(32)]
CORRUGATED STAINLESS STEEL TUBING (CSST)
| Gas | Undiluted Propane |
| Inlet Pressure | 11.0 in. w.c. |
| Pressure Drop | 0.5 in. w.c. |
| Specific Gravity | 1.50 |
| INTENDED USE: SIZING BETWEEN SINGLE OR SECOND STAGE (Low Pressure) REGULATOR AND THE APPLIANCE SHUTOFF VALVE | ||||||||||||||
| TUBE SIZE (EHD) | ||||||||||||||
| Flow
Designation
|
13 | 15 | 18 | 19 | 23 | 25 | 30 | 31 | 37 | 39 | 46 | 48 | 60 | 62 |
| Length (ft) | Capacity in Thousands of Btu per Hour | |||||||||||||
| 5 | 72 | 99 | 181 | 211 | 355 | 426 | 744 | 863 | 1,420 | 1,638 | 2,830 | 3,270 | 5,780 | 6,550 |
| 10 | 50 | 69 | 129 | 150 | 254 | 303 | 521 | 605 | 971 | 1,179 | 1,990 | 2,320 | 4,110 | 4,640 |
| 15 | 39 | 55 | 104 | 121 | 208 | 248 | 422 | 490 | 775 | 972 | 1,620 | 1,900 | 3,370 | 3,790 |
| 20 | 34 | 49 | 91 | 106 | 183 | 216 | 365 | 425 | 661 | 847 | 1,400 | 1,650 | 2,930 | 3,290 |
| 25 | 30 | 42 | 82 | 94 | 164 | 192 | 325 | 379 | 583 | 762 | 1,250 | 1,480 | 2,630 | 2,940 |
| 30 | 28 | 39 | 74 | 87 | 151 | 177 | 297 | 344 | 528 | 698 | 1,140 | 1,350 | 2,400 | 2,680 |
| 40 | 23 | 33 | 64 | 74 | 131 | 153 | 256 | 297 | 449 | 610 | 988 | 1,170 | 2,090 | 2,330 |
| 50 | 20 | 30 | 58 | 66 | 118 | 137 | 227 | 265 | 397 | 548 | 884 | 1,050 | 1,870 | 2,080 |
| 60 | 19 | 26 | 53 | 60 | 107 | 126 | 207 | 241 | 359 | 502 | 805 | 961 | 1,710 | 1,900 |
| 70 | 17 | 25 | 49 | 57 | 99 | 117 | 191 | 222 | 330 | 466 | 745 | 890 | 1,590 | 1,760 |
| 80 | 15 | 23 | 45 | 52 | 94 | 109 | 178 | 208 | 307 | 438 | 696 | 833 | 1,490 | 1,650 |
| 90 | 15 | 22 | 44 | 50 | 90 | 102 | 169 | 197 | 286 | 414 | 656 | 787 | 1,400 | 1,550 |
| 100 | 14 | 20 | 41 | 47 | 85 | 98 | 159 | 186 | 270 | 393 | 621 | 746 | 1,330 | 1,480 |
| 150 | 11 | 15 | 31 | 36 | 66 | 75 | 123 | 143 | 217 | 324 | 506 | 611 | 1,090 | 1,210 |
| 200 | 9 | 14 | 28 | 33 | 60 | 69 | 112 | 129 | 183 | 283 | 438 | 531 | 948 | 1,050 |
| 250 | 8 | 12 | 25 | 30 | 53 | 61 | 99 | 117 | 163 | 254 | 390 | 476 | 850 | 934 |
| 300 | 8 | 11 | 23 | 26 | 50 | 57 | 90 | 107 | 147 | 234 | 357 | 434 | 777 | 854 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
- Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings or bends.
- EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
- Table entries have been rounded to three significant digits.
TABLE G2413.4(17) [402.4(33)]
CORRUGATED STAINLESS STEEL TUBING (CSST)
| Gas | Undiluted Propane |
| Inlet Pressure | 2.0 psi |
| Pressure Drop | 1.0 psi |
| Specific Gravity | 1.50 |
| INTENDED USE: SIZING BETWEEN 2 PSI SERVICE AND THE LINE PRESSURE REGULATOR | ||||||||||||||
| TUBE SIZE (EHD) | ||||||||||||||
| Flow
Designation
|
13 | 15 | 18 | 19 | 23 | 25 | 30 | 31 | 37 | 39 | 46 | 48 | 60 | 62 |
| Length (ft) | Capacity in Thousands of Btu per Hour | |||||||||||||
| 10 | 426 | 558 | 927 | 1,110 | 1,740 | 2,170 | 4,100 | 4,720 | 7,130 | 7,958 | 15,200 | 16,800 | 29,400 | 34,200 |
| 25 | 262 | 347 | 591 | 701 | 1,120 | 1,380 | 2,560 | 2,950 | 4,560 | 5,147 | 9,550 | 10,700 | 18,800 | 21,700 |
| 30 | 238 | 316 | 540 | 640 | 1,030 | 1,270 | 2,330 | 2,690 | 4,180 | 4,719 | 8,710 | 9,790 | 17,200 | 19,800 |
| 40 | 203 | 271 | 469 | 554 | 896 | 1,100 | 2,010 | 2,320 | 3,630 | 4,116 | 7,530 | 8,500 | 14,900 | 17,200 |
| 50 | 181 | 243 | 420 | 496 | 806 | 986 | 1,790 | 2,070 | 3,260 | 3,702 | 6,730 | 7,610 | 13,400 | 15,400 |
| 75 | 147 | 196 | 344 | 406 | 663 | 809 | 1,460 | 1,690 | 2,680 | 3,053 | 5,480 | 6,230 | 11,000 | 12,600 |
| 80 | 140 | 189 | 333 | 393 | 643 | 768 | 1,410 | 1,630 | 2,590 | 2,961 | 5,300 | 6,040 | 10,600 | 12,200 |
| 100 | 124 | 169 | 298 | 350 | 578 | 703 | 1,260 | 1,450 | 2,330 | 2,662 | 4,740 | 5,410 | 9,530 | 10,900 |
| 150 | 101 | 137 | 245 | 287 | 477 | 575 | 1,020 | 1,180 | 1,910 | 2,195 | 3,860 | 4,430 | 7,810 | 8,890 |
| 200 | 86 | 118 | 213 | 248 | 415 | 501 | 880 | 1,020 | 1,660 | 1,915 | 3,340 | 3,840 | 6,780 | 7,710 |
| 250 | 77 | 105 | 191 | 222 | 373 | 448 | 785 | 910 | 1,490 | 1,722 | 2,980 | 3,440 | 6,080 | 6,900 |
| 300 | 69 | 96 | 173 | 203 | 343 | 411 | 716 | 829 | 1,360 | 1,578 | 2,720 | 3,150 | 5,560 | 6,300 |
| 400 | 60 | 82 | 151 | 175 | 298 | 355 | 616 | 716 | 1,160 | 1,376 | 2,350 | 2,730 | 4,830 | 5,460 |
| 500 | 53 | 72 | 135 | 158 | 268 | 319 | 550 | 638 | 1,030 | 1,237 | 2,100 | 2,450 | 4,330 | 4,880 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
- Table does not include effect of pressure drop across the line regulator. Where regulator loss exceeds 1/2 psi (based on 13 in. w.c. outlet pressure), DO NOT USE THIS TABLE. Consult with the regulator manufacturer for pressure drops and capacity factors. Pressure drops across a regulator can vary with flow rate.
- CAUTION: Capacities shown in the table might exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guidance.
- Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings or bends.
- EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
- Table entries have been rounded to three significant digits.
TABLE G2413.4(18) [402.4(34)]
CORRUGATED STAINLESS STEEL TUBING (CSST)
| Gas | Undiluted Propane |
| Inlet Pressure | 5.0 psi |
| Pressure Drop | 3.5 psi |
| Specific Gravity | 1.50 |
| TUBE SIZE (EHD) | ||||||||||||||
| Flow Designation | 13 | 15 | 18 | 19 | 23 | 25 | 30 | 31 | 37 | 39 | 46 | 48 | 60 | 62 |
| Length (ft) | Capacity in Thousands of Btu per Hour | |||||||||||||
| 10 | 826 | 1,070 | 1,710 | 2,060 | 3,150 | 4,000 | 7,830 | 8,950 | 13,100 | 14,441 | 28,600 | 31,200 | 54,400 | 63,800 |
| 25 | 509 | 664 | 1,090 | 1,310 | 2,040 | 2,550 | 4,860 | 5,600 | 8,400 | 9,339 | 18,000 | 19,900 | 34,700 | 40,400 |
| 30 | 461 | 603 | 999 | 1,190 | 1,870 | 2,340 | 4,430 | 5,100 | 7,680 | 8,564 | 16,400 | 18,200 | 31,700 | 36,900 |
| 40 | 396 | 520 | 867 | 1,030 | 1,630 | 2,030 | 3,820 | 4,400 | 6,680 | 7,469 | 14,200 | 15,800 | 27,600 | 32,000 |
| 50 | 352 | 463 | 777 | 926 | 1,460 | 1,820 | 3,410 | 3,930 | 5,990 | 6,717 | 12,700 | 14,100 | 24,700 | 28,600 |
| 75 | 284 | 376 | 637 | 757 | 1,210 | 1,490 | 2,770 | 3,190 | 4,920 | 5,539 | 10,300 | 11,600 | 20,300 | 23,400 |
| 80 | 275 | 363 | 618 | 731 | 1,170 | 1,450 | 2,680 | 3,090 | 4,770 | 5,372 | 9,990 | 11,200 | 19,600 | 22,700 |
| 100 | 243 | 324 | 553 | 656 | 1,050 | 1,300 | 2,390 | 2,760 | 4,280 | 4,830 | 8,930 | 10,000 | 17,600 | 20,300 |
| 150 | 196 | 262 | 453 | 535 | 866 | 1,060 | 1,940 | 2,240 | 3,510 | 3,983 | 7,270 | 8,210 | 14,400 | 16,600 |
| 200 | 169 | 226 | 393 | 464 | 755 | 923 | 1,680 | 1,930 | 3,050 | 3,474 | 6,290 | 7,130 | 12,500 | 14,400 |
| 250 | 150 | 202 | 352 | 415 | 679 | 828 | 1,490 | 1,730 | 2,740 | 3,124 | 5,620 | 6,390 | 11,200 | 12,900 |
| 300 | 136 | 183 | 322 | 379 | 622 | 757 | 1,360 | 1,570 | 2,510 | 2,865 | 5,120 | 5,840 | 10,300 | 11,700 |
| 400 | 117 | 158 | 279 | 328 | 542 | 657 | 1,170 | 1,360 | 2,180 | 2,498 | 4,430 | 5,070 | 8,920 | 10,200 |
| 500 | 104 | 140 | 251 | 294 | 488 | 589 | 1,050 | 1,210 | 1,950 | 2,247 | 3,960 | 4,540 | 8,000 | 9,110 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Notes:
- Table does not include effect of pressure drop across line regulator. Where regulator loss exceeds 1 psi, DO NOT USE THIS TABLE. Consult with the regulator manufacturer for pressure drops and capacity factors. Pressure drop across regulator can vary with the flow rate.
- CAUTION: Capacities shown in the table might exceed maximum capacity of selected regulator. Consult with the tubing manufacturer for guidance.
- Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends or fittings shall be increased by an equivalent length of tubing to the following equation: L = 1.3n where L is additional length (feet) of tubing and n is the number of additional fittings or bends.
- EHD—Equivalent Hydraulic Diameter, which is a measure of the relative hydraulic efficiency between different tubing sizes. The greater the value of EHD, the greater the gas capacity of the tubing.
- Table entries have been rounded to three significant digits.
TABLE G2413.4(19) [402.4(35)]
POLYETHYLENE PLASTIC PIPE
| Gas | Undiluted Propane |
| Inlet Pressure | 11.0 in. w.c. |
| Pressure Drop | 0.5 in. w.c. |
| Specific Gravity | 1.50 |
| INTENDED USE: PE PIPE SIZING BETWEEN INTEGRAL 2-STAGE REGULATOR AT TANK OR SECOND STAGE (low-pressure regulator) AND BUILDING | ||||||
| PIPE SIZE (inches) | ||||||
| Nominal OD | 1/2 | 3/4 | 1 | 11/4 | 11/2 | 2 |
| Designation | SDR 9 | SDR 11 | SDR 11 | SDR 10 | SDR 11 | SDR 11 |
| Actual ID | 0.660 | 0.860 | 1.077 | 1.328 | 1.554 | 1.943 |
| Length (ft) | Capacity in Thousands of Btu per Hour | |||||
| 10 | 340 | 680 | 1,230 | 2,130 | 3,210 | 5,770 |
| 20 | 233 | 468 | 844 | 1,460 | 2,210 | 3,970 |
| 30 | 187 | 375 | 677 | 1,170 | 1,770 | 3,180 |
| 40 | 160 | 321 | 580 | 1,000 | 1,520 | 2,730 |
| 50 | 142 | 285 | 514 | 890 | 1,340 | 2,420 |
| 60 | 129 | 258 | 466 | 807 | 1,220 | 2,190 |
| 70 | 119 | 237 | 428 | 742 | 1,120 | 2,010 |
| 80 | 110 | 221 | 398 | 690 | 1,040 | 1,870 |
| 90 | 103 | 207 | 374 | 648 | 978 | 1,760 |
| 100 | 98 | 196 | 353 | 612 | 924 | 1,660 |
| 125 | 87 | 173 | 313 | 542 | 819 | 1,470 |
| 150 | 78 | 157 | 284 | 491 | 742 | 1,330 |
| 175 | 72 | 145 | 261 | 452 | 683 | 1,230 |
| 200 | 67 | 135 | 243 | 420 | 635 | 1,140 |
| 250 | 60 | 119 | 215 | 373 | 563 | 1,010 |
| 300 | 54 | 108 | 195 | 338 | 510 | 916 |
| 350 | 50 | 99 | 179 | 311 | 469 | 843 |
| 400 | 46 | 92 | 167 | 289 | 436 | 784 |
| 450 | 43 | 87 | 157 | 271 | 409 | 736 |
| 500 | 41 | 82 | 148 | 256 | 387 | 695 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: Table entries have been rounded to three significant digits.
TABLE G2413.4(20) [402.4(36)]
POLYETHYLENE PLASTIC PIPE
| Gas | Undiluted Propane |
| Inlet Pressure | 2.0 psi |
| Pressure Drop | 1.0 psi |
| Specific Gravity | 1.50 |
| INTENDED USE: PE PIPE SIZING BETWEEN 2 PSIG SERVICE REGULATOR AND LINE PRESSURE REGULATOR | ||||||
| PIPE SIZE (inches) | ||||||
| Nominal OD | 1/2 | 3/4 | 1 | 11/4 | 11/2 | 2 |
| Designation | SDR 9 | SDR 11 | SDR 11 | SDR 10 | SDR 11 | SDR 11 |
| Actual ID | 0.660 | 0.860 | 1.077 | 1.328 | 1.554 | 1.943 |
| Length (ft) | Capacity in Thousands of Btu per Hour | |||||
| 10 | 3,130 | 6,260 | 11,300 | 19,600 | 29,500 | 53,100 |
| 20 | 2,150 | 4,300 | 7,760 | 13,400 | 20,300 | 36,500 |
| 30 | 1,730 | 3,450 | 6,230 | 10,800 | 16,300 | 29,300 |
| 40 | 1,480 | 2,960 | 5,330 | 9,240 | 14,000 | 25,100 |
| 50 | 1,310 | 2,620 | 4,730 | 8,190 | 12,400 | 22,200 |
| 60 | 1,190 | 2,370 | 4,280 | 7,420 | 11,200 | 20,100 |
| 70 | 1,090 | 2,180 | 3,940 | 6,830 | 10,300 | 18,500 |
| 80 | 1,010 | 2,030 | 3,670 | 6,350 | 9,590 | 17,200 |
| 90 | 952 | 1,910 | 3,440 | 5,960 | 9,000 | 16,200 |
| 100 | 899 | 1,800 | 3,250 | 5,630 | 8,500 | 15,300 |
| 125 | 797 | 1,600 | 2,880 | 4,990 | 7,530 | 13,500 |
| 150 | 722 | 1,450 | 2,610 | 4,520 | 6,830 | 12,300 |
| 175 | 664 | 1,330 | 2,400 | 4,160 | 6,280 | 11,300 |
| 200 | 618 | 1,240 | 2,230 | 3,870 | 5,840 | 10,500 |
| 250 | 548 | 1,100 | 1,980 | 3,430 | 5,180 | 9,300 |
| 300 | 496 | 994 | 1,790 | 3,110 | 4,690 | 8,430 |
| 350 | 457 | 914 | 1,650 | 2,860 | 4,320 | 7,760 |
| 400 | 425 | 851 | 1,530 | 2,660 | 4,020 | 7,220 |
| 450 | 399 | 798 | 1,440 | 2,500 | 3,770 | 6,770 |
| 500 | 377 | 754 | 1,360 | 2,360 | 3,560 | 6,390 |
| 550 | 358 | 716 | 1,290 | 2,240 | 3,380 | 6,070 |
| 600 | 341 | 683 | 1,230 | 2,140 | 3,220 | 5,790 |
| 650 | 327 | 654 | 1,180 | 2,040 | 3,090 | 5,550 |
| 700 | 314 | 628 | 1,130 | 1,960 | 2,970 | 5,330 |
| 750 | 302 | 605 | 1,090 | 1,890 | 2,860 | 5,140 |
| 800 | 292 | 585 | 1,050 | 1,830 | 2,760 | 4,960 |
| 850 | 283 | 566 | 1,020 | 1,770 | 2,670 | 4,800 |
| 900 | 274 | 549 | 990 | 1,710 | 2,590 | 4,650 |
| 950 | 266 | 533 | 961 | 1,670 | 2,520 | 4,520 |
| 1,000 | 259 | 518 | 935 | 1,620 | 2,450 | 4,400 |
| 1,100 | 246 | 492 | 888 | 1,540 | 2,320 | 4,170 |
| 1,200 | 234 | 470 | 847 | 1,470 | 2,220 | 3,980 |
| 1,300 | 225 | 450 | 811 | 1,410 | 2,120 | 3,810 |
| 1,400 | 216 | 432 | 779 | 1,350 | 2,040 | 3,660 |
| 1,500 | 208 | 416 | 751 | 1,300 | 1,960 | 3,530 |
| 1,600 | 201 | 402 | 725 | 1,260 | 1,900 | 3,410 |
| 1,700 | 194 | 389 | 702 | 1,220 | 1,840 | 3,300 |
| 1,800 | 188 | 377 | 680 | 1,180 | 1,780 | 3,200 |
| 1,900 | 183 | 366 | 661 | 1,140 | 1,730 | 3,110 |
| 2,000 | 178 | 356 | 643 | 1,110 | 1,680 | 3,020 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: Table entries have been rounded to three significant digits.
TABLE G2413.4(21) [402.4(37)]
POLYETHYLENE PLASTIC TUBING
| Gas | Undiluted Propane |
| Inlet Pressure | 11.0 in. w.c. |
| Pressure Drop | 0.5 in. w.c. |
| Specific Gravity | 1.50 |
| INTENDED USE: PE PIPE SIZING BETWEEN INTEGRAL 2-STAGE REGULATOR AT TANK OR SECOND STAGE (low-pressure regulator) AND BUILDING | ||
| Plastic Tubing Size (CTS) (inch) | ||
| Nominal OD | 1/2 | 1 |
| Designation | SDR 7 | SDR 11 |
| Actual ID | 0.445 | 0.927 |
| Length (ft) | Capacity in Cubic Feet of Gas per Hour | |
| 10 | 121 | 828 |
| 20 | 83 | 569 |
| 30 | 67 | 457 |
| 40 | 57 | 391 |
| 50 | 51 | 347 |
| 60 | 46 | 314 |
| 70 | 42 | 289 |
| 80 | 39 | 269 |
| 90 | 37 | 252 |
| 100 | 35 | 238 |
| 125 | 31 | 211 |
| 150 | 28 | 191 |
| 175 | 26 | 176 |
| 200 | 24 | 164 |
| 225 | 22 | 154 |
| 250 | 21 | 145 |
| 275 | 20 | 138 |
| 300 | 19 | 132 |
| 350 | 18 | 121 |
| 400 | 16 | 113 |
| 450 | 15 | 106 |
| 500 | 15 | 100 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1-inch water column = 0.2488 kPa, 1 British thermal unit per hour = 0.2931 W, 1 cubic foot per hour = 0.0283 m3/h, 1 degree = 0.01745 rad.
Note: Table entries have been rounded to three significant digits.
The pipe size of each section of gas piping shall be determined using the longest length of piping from the point of delivery to the most remote outlet and the load of the section.
Pipe shall be sized as follows:
- Pipe size of each section of the longest pipe run from the point of delivery to the most remote outlet shall be determined using the longest run of piping and the load of the section.
- The pipe size of each section of branch piping not previously sized shall be determined using the length of piping from the point of delivery to the most remote outlet in each branch and the load of the section.
The pipe size for each section of higher pressure gas piping shall be determined using the longest length of piping from the point of delivery to the most remote line pressure regulator. The pipe size from the line pressure regulator to each outlet shall be determined using the length of piping from the regulator to the most remote outlet served by the regulator.
Noncorrugated stainless steel tubing shall be sized in accordance with Equations 24-3 and 24-4 of Section 2413.4 in conjunction with Section 2413.4.1, 2413.4.2 or 2413.4.3.
The design pressure loss in any piping system under maximum demand, from the point of delivery to the inlet connection of all appliances served, shall be such that the supply pressure at each appliance inlet is greater than or equal to the minimum pressure required by the appliance.
The maximum design operating pressure for piping systems located inside buildings shall not exceed 5 pounds per square inch gauge (psig) (34 kPa gauge) except where one or more of the following conditions are met:
- The piping joints are welded or brazed.
- The piping is joined by fittings listed to ANSI LC4/CSA 6.32 and installed in accordance with the manufacturer's instructions.
- The piping joints are flanged and pipe-to-flange connections are made by welding or brazing.
- The piping is located in a ventilated chase or otherwise enclosed for protection against accidental gas accumulation.
- The piping is a temporary installation for buildings under construction.
LP-gas systems designed to operate below -5°F (-21°C) or with butane or a propane-butane mix shall be designed to either accommodate liquid LP-gas or prevent LP-gas vapor from condensing into a liquid.
Materials used for piping systems shall comply with the requirements of this chapter or shall be approved.
Cast-iron pipe shall not be used.
Steel, stainless steel and wrought-iron pipe shall not be lighter than Schedule 10 and shall comply with the dimensional standards of ASME B36.10M and one of the following standards:
- ASTM A53/A53M.
- ASTM A106.
- ASTM A312.
Steel tubing shall comply with ASTM A254.
Stainless steel tubing shall comply with ASTM A268 or ASTM A269.
Copper tubing shall comply with Standard Type K or L of ASTM B88 or ASTM B280.
Copper and copper-alloy tubing shall not be used if the gas contains more than an average of 0.3 grains of hydrogen sulfide per 100 standard cubic feet of gas (0.7 milligrams per 100 liters).
Corrugated stainless steel tubing shall be listed in accordance with ANSI LC1/CSA 6.26.
- Factory-assembled anodeless risers shall be recommended by the manufacturer for the gas used and shall be leak tested by the manufacturer in accordance with written procedures.
- Service head adapters and field-assembled anodeless risers incorporating service head adapters shall be recommended by the manufacturer for the gas used, and shall be designed and certified to meet the requirements of Category I of ASTM D2513, and US Department of Transportation, Code of Federal Regulations, Title 49 CFR, Part 192.281(e). The manufacturer shall provide the user with qualified installation instructions as prescribed by the US Department of Transportation, Code of Federal Regulations, Title 49 CFR, Part 192.283(b).
The use of plastic pipe, tubing and fittings in undiluted liquefied petroleum gas piping systems shall be in accordance with NFPA 58.
Plastic pipe and fittings used to connect regulator vents to remote vent terminations shall be of PVC conforming to ANSI/UL 651. PVC vent piping shall not be installed indoors.
Pipe, tubing and fittings shall be clear and free from cutting burrs and defects in structure or threading, and shall be thoroughly brushed, and chip and scale blown.
Defects in pipe, tubing and fittings shall not be repaired. Defective pipe, tubing and fittings shall be replaced. (See Section G2417.1.2.)
Field threading of metallic pipe shall be in accordance with Table G2414.8.2.
Threaded joints shall be made using a thread joint sealing material. Thread joint sealing materials shall be nonhardening and shall be resistant to the chemical constituents of the gases to be conveyed through the piping. Thread joint sealing materials shall be compatible with the pipe and fitting materials on which the sealing materials are used.
The type of piping joint used shall be suitable for the pressure-temperature conditions and shall be selected giving consideration to joint tightness and mechanical strength under the service conditions. The joint shall be able to sustain the maximum end force caused by the internal pressure and any additional forces caused by temperature expansion or contraction, vibration, fatigue, or to the weight of the pipe and its contents.
Schedule 40 and heavier pipe joints shall be threaded, flanged, brazed, welded or assembled with press-connect fittings listed in accordance with ANSI LC4/CSA 6.32. Pipe lighter than Schedule 40 shall be connected using press-connect fittings, flanges, brazing or welding. Where nonferrous pipe is brazed, the brazing materials shall have a melting point in excess of 1,000°F (538°C). Brazing alloys shall not contain more than 0.05-percent phosphorus.
Copper tubing joints shall be assembled with approved gas tubing fittings, shall be brazed with a material having a melting point in excess of 1,000°F (538°C) or assembled with press-connect fittings listed in accordance with ANSI LC4/CSA 6.32. Brazing alloys shall not contain more than 0.05-percent phosphorus.
UpCodes Diagram (1)
Flared joints shall be used only in systems constructed from nonferrous pipe and tubing where experience or tests have demonstrated that the joint is suitable for the conditions and where provisions are made in the design to prevent separation of the joints.
Metallic fittings shall comply with the following:
- Fittings used with steel, stainless steel or wrought-iron pipe shall be steel, stainless steel, copper alloy, malleable iron or cast iron.
- Fittings used with copper or copper alloy pipe shall be copper or copper alloy.
- Cast-iron bushings shall be prohibited.
- Special fittings. Fittings such as couplings, proprietary-type joints, saddle tees, gland-type compression fittings, and flared, flareless and compression-type tubing fittings shall be: used within the fitting manufacturer's pressure-temperature recommendations; used within the service conditions anticipated with respect to vibration, fatigue, thermal expansion and contraction; and shall be approved.
- Where pipe fittings are drilled and tapped in the field, the operation shall be in accordance with all of the following:
- The operation shall be performed on systems having operating pressures of 5 psi (34.5 kPa) or less.
- The operation shall be performed by the gas supplier or the gas supplier's designated representative.
- The drilling and tapping operation shall be performed in accordance with written procedures prepared by the gas supplier.
- The fittings shall be located outdoors.
- The tapped fitting assembly shall be inspected and proven to be free of leakage.
Plastic pipe, tubing and fittings shall be joined in accordance with the manufacturers' instructions. Such joints shall comply with the following:
- The joints shall be designed and installed so that the longitudinal pull-out resistance of the joint will be greater than or equal to the tensile strength of the plastic piping material.
- Heat-fusion joints shall be made in accordance with qualified procedures that have been established and proven by test to produce gastight joints as strong as or stronger than the pipe or tubing being joined. Joints shall be made with the joining method recommended by the pipe manufacturer. Polyethylene heat fusion fittings shall be marked "ASTM D2513." Polyamide heat fusion fittings shall be marked "ASTM F2945."
- Where compression-type mechanical joints are used, the gasket material in the fitting shall be compatible with the plastic piping and with the gas distributed by the system. An internal tubular rigid stiffener shall be used in conjunction with the fitting. The stiffener shall be flush with the end of the pipe or tubing and shall extend to or beyond the outside end of the compression fitting when installed. The stiffener shall be free of rough or sharp edges and shall not be a force-fit in the plastic. Split tubular stiffeners shall not be used.
- Plastic piping joints and fittings for use in liquefied petroleum gas piping systems shall be in accordance with NFPA 58.
Materials used shall be installed in strict accordance with the standards under which the materials are accepted and approved. In the absence of such installation procedures, the manufacturer's instructions shall be followed. Where the requirements of referenced standards or manufacturer's instructions do not conform to minimum provisions of this code, the provisions of this code shall apply.
CSST piping systems shall be installed in accordance with the terms of their approval, the conditions of listing, the manufacturer's instructions and this code.
Concealed piping shall not be located in solid partitions and solid walls, unless installed in a chase or casing.
Fittings installed in concealed locations shall be limited to the following types:
- Threaded elbows, tees, couplings, plugs and caps.
- Brazed fittings.
- Welded fittings.
- Fittings listed to ANSI LC1/CSA 6.26 or ANSI LC4/CSA 6.32.
Gas piping shall not penetrate building foundation walls at any point below grade. Gas piping shall enter and exit a building at a point above grade and the annular space between the pipe and the wall shall be sealed.
Where piping is installed through holes or notches in framing members and the piping is located less than 11/2 inches (38 mm) from the framing member face to which wall, ceiling or floor membranes will be attached, the pipe shall be protected by shield plates that cover the width of the pipe and the framing member and that extend not less than 4 inches (102 mm) to each side of the framing member. Where the framing member that the piping passes through is a bottom plate, bottom track, top plate or top track, the shield plates shall cover the framing member and extend not less than 4 inches (102 mm) above the bottom framing member and not less than 4 inches (102 mm) below the top framing member.
Where the piping is located within a framing member and is less than 11/2 inches (38 mm) from the framing member face to which wall, ceiling or floor membranes will be attached, the piping shall be protected by shield plates that cover the width and length of the piping. Where the piping is located outside of a framing member and is located less than 11/2 inches (38 mm) from the nearest edge of the face of the framing member to which the membrane will be attached, the piping shall be protected by shield plates that cover the width and length of the piping.
Shield plates shall be of steel material having a thickness of not less than 0.0575 inch (1.463 mm) (No. 16 gage).
Piping in solid floors shall be laid in channels in the floor and covered in a manner that will allow access to the piping with a minimum amount of damage to the building. Where such piping is subject to exposure to excessive moisture or corrosive substances, the piping shall be protected in an approved manner. As an alternative to installation in channels, the piping shall be installed in a conduit of Schedule 40 steel, wrought iron, PVC or ABS pipe in accordance with Section G2415.8.1 or G2415.8.2.
The conduit shall extend into an occupiable portion of the building and, at the point where the conduit terminates in the building, the space between the conduit and the gas piping shall be sealed to prevent the possible entrance of any gas leakage. The conduit shall extend not less than 2 inches (51 mm) beyond the point where the pipe emerges from the floor. If the end sealing is capable of withstanding the full pressure of the gas pipe, the conduit shall be designed for the same pressure as the pipe. Such conduit shall extend not less than 4 inches (102 mm) outside the building, shall be vented above grade to the outdoors and shall be installed so as to prevent the entrance of water and insects.
Where the conduit originates and terminates within the same building, the conduit shall originate and terminate in an accessible portion of the building and shall not be sealed. The conduit shall extend not less than 2 inches (51 mm) beyond the point where the pipe emerges from the floor.
Piping installed outdoors shall be elevated not less than 31/2 inches (89 mm) above ground and where installed across roof surfaces, shall be elevated not less than 31/2 inches (89 mm) above the roof surface. Piping installed above ground, outdoors, and installed across the surface of roofs shall be securely supported and located where it will be protected from physical damage. Where passing through an outside wall, the piping shall be protected against corrosion by coating or wrapping with an inert material. Where piping is encased in a protective pipe sleeve, the annular space between the piping and the sleeve shall be sealed.
Metallic piping and metallic tubing that conveys fuel gas from an LP-gas storage container shall be provided with an approved dielectric fitting to electrically isolate the underground portion of the pipe or tube from the above-ground portion that enters a building. Such dielectric fitting shall be installed above ground, outdoors.
Steel pipe or tubing exposed to corrosive action, such as soil condition or moisture, shall be protected in accordance with Sections G2415.11.1 through G2415.11.4.
Zinc coating shall not be deemed adequate protection for underground gas piping.
Underground piping shall comply with one or more of the following:
- The piping shall be made of corrosion-resistant material that is suitable for the environment in which it will be installed.
- Pipe shall have a factory-applied, electrically insulating coating. Fittings and joints between sections of coated pipe shall be coated in accordance with the coating manufacturer's instructions.
- The piping shall have a cathodic protection system installed and the system shall be monitored and maintained in accordance with an approved program.
Where dissimilar metals are joined underground, an insulating coupling or fitting shall be used.
Steel risers connected to plastic piping shall be cathodically protected by means of a welded anode, except where such risers are anodeless risers.
Underground piping systems shall be installed a minimum depth of 12 inches (305 mm) below grade, except as provided for in Section G2415.12.1.
Individual lines to outdoor lights, grills and other appliances shall be installed not less than 8 inches (203 mm) below finished grade, provided that such installation is approved and is installed in locations not susceptible to physical damage.
The trench shall be graded so that the pipe has a firm, substantially continuous bearing on the bottom of the trench.
Piping installed underground beneath buildings is prohibited except where the piping is encased in a conduit of wrought iron, plastic pipe, steel pipe, a piping or encasement system listed for installation beneath buildings, or other approved conduit material designed to withstand the superimposed loads. The conduit shall be protected from corrosion in accordance with Section G2415.11 and shall be installed in accordance with Section G2415.14.1 or G2415.14.2.
The conduit shall extend into an occupiable portion of the building and, at the point where the conduit terminates in the building, the space between the conduit and the gas piping shall be sealed to prevent the possible entrance of any gas leakage. The conduit shall extend not less than 2 inches (51 mm) beyond the point where the pipe emerges from the floor. Where the end sealing is capable of withstanding the full pressure of the gas pipe, the conduit shall be designed for the same pressure as the pipe. Such conduit shall extend not less than 4 inches (102 mm) outside the building, shall be vented above grade to the outdoors and shall be installed so as to prevent the entrance of water and insects.
Where the conduit originates and terminates within the same building, the conduit shall originate and terminate in an accessible portion of the building and shall not be sealed. The conduit shall extend not less than 2 inches (51 mm) beyond the point where the pipe emerges from the floor.
Gas outlets that do not connect to appliances shall be capped gastight.
Exception: Listed and labeled flush-mounted-type quick-disconnect devices and listed and labeled gas convenience outlets shall be installed in accordance with the manufacturer's instructions.
The unthreaded portion of piping outlets shall extend not less than l inch (25 mm) through finished ceilings and walls and where extending through floors or outdoor patios and slabs, shall be not less than 2 inches (51 mm) above them. The outlet fitting or piping shall be securely supported. Outlets shall not be placed behind doors. Outlets shall be located in the room or space where the appliance is installed.
Exception: Listed and labeled flush-mounted-type quick-disconnect devices and listed and labeled gas convenience outlets shall be installed in accordance with the manufacturer's instructions.
Plastic pipe shall be installed outdoors underground only. Plastic pipe shall not be used within or under any building or slab or be operated at pressures greater than 100 psig (689 kPa) for natural gas or 30 psig (207 kPa) for LP-gas.
Exceptions:
- Plastic pipe shall be permitted to terminate above ground outside of buildings where installed in premanufactured anodeless risers or service head adapter risers that are installed in accordance with the manufacturer's instructions.
- Plastic pipe shall be permitted to terminate with a wall head adapter within buildings where the plastic pipe is inserted in a piping material for fuel gas use in buildings.
- Plastic pipe shall be permitted under outdoor patio, walkway and driveway slabs provided that the burial depth complies with Section G2415.12.
Connections made outdoors and underground between metallic and plastic piping shall be made only with transition fittings conforming to ASTM D2513 Category I or ASTM F1973.
A yellow-insulated copper tracer wire or other approved conductor, or a product specifically designed for that purpose, shall be installed adjacent to underground nonmetallic piping. Access shall be provided to the tracer wire or the tracer wire shall terminate above ground at each end of the nonmetallic piping. The tracer wire size shall be not less than 18 AWG and the insulation type shall be suitable for direct burial.
The interior of piping shall be clear of debris. The use of a flammable or combustible gas to clean or remove debris from a piping system shall be prohibited.
A device shall not be placed inside the piping or fittings that will reduce the cross-sectional area or otherwise obstruct the free flow of gas.
Exceptions:
- Approved gas filters.
- An approved fitting or device where the gas piping system has been sized to accommodate the pressure drop of the fitting or device.
Before any system of piping is put in service or concealed, it shall be tested to ensure that it is gastight. Testing, inspection and purging of piping systems shall comply with Section G2417.
- Bends shall be made only with bending tools and procedures intended for that purpose.
- Bends shall be smooth and free from buckling, cracks or other evidence of mechanical damage.
- The longitudinal weld of the pipe shall be near the neutral axis of the bend.
- Pipe shall not be bent through an arc of more than 90 degrees (1.6 rad).
- The inside radius of a bend shall be not less than six times the outside diameter of the pipe.
- The pipe shall not be damaged and the internal diameter of the pipe shall not be effectively reduced.
- Joints shall not be located in pipe bends.
- The radius of the inner curve of such bends shall be not less than 25 times the inside diameter of the pipe.
- Where the piping manufacturer specifies the use of special bending tools or procedures, such tools or procedures shall be used.
Prior to acceptance and initial operation, all piping installations shall be visually inspected and pressure tested to determine that the materials, design, fabrication and installation practices comply with the requirements of this code.
Inspection shall consist of visual examination, during or after manufacture, fabrication, assembly or pressure tests.
In the event repairs or additions are made after the pressure test, the affected piping shall be tested.
A piping system shall be permitted to be tested as a complete unit or in sections. A valve in a line shall not be used as a bulkhead between gas in one section of the piping system and test medium in an adjacent section, except where a double block and bleed valve system is installed. A valve shall not be subjected to the test pressure unless it can be determined that the valve, including the valve-closing mechanism, is designed to safely withstand the test pressure.
Regulator and valve assemblies fabricated independently of the piping system in which they are to be installed shall be permitted to be tested with inert gas or air at the time of fabrication.
Prior to testing, the interior of the pipe shall be cleared of all foreign material.
The test medium shall be air, nitrogen, carbon dioxide or an inert gas. Oxygen shall not be used as a test medium.
Expansion joints shall be provided with temporary restraints, if required, for the additional thrust load under test.
Appliances and equipment that are not to be included in the test shall be either disconnected from the piping or isolated by blanks, blind flanges or caps.
Where the piping system is connected to appliances or equipment designed for operating pressures of less than the test pressure, such appliances or equipment shall be isolated from the piping system by disconnecting them and capping the outlet(s).
Where the piping system is connected to appliances or equipment designed for operating pressures equal to or greater than the test pressure, such appliances or equipment shall be isolated from the piping system by closing the individual appliance or equipment shutoff valve(s).
Testing of piping systems shall be performed in a manner that protects the safety of employees and the public during the test.
Test pressure shall be measured with a manometer or with a pressure-measuring device designed and calibrated to read, record, or indicate a pressure loss caused by leakage during the pressure test period. The source of pressure shall be isolated before the pressure tests are made. Mechanical gauges used to measure test pressures shall have a range such that the highest end of the scale is not greater than five times the test pressure.
The test pressure to be used shall be not less than 11/2 times the proposed maximum working pressure, but not less than 3 psig (20 kPa gauge), irrespective of design pressure. Where the test pressure exceeds 125 psig (862 kPa gauge), the test pressure shall not exceed a value that produces a hoop stress in the piping greater than 50 percent of the specified minimum yield strength of the pipe.
The test duration shall be not less than 10 minutes.
The piping system shall withstand the test pressure specified without showing any evidence of leakage or other defects. Any reduction of test pressures as indicated by pressure gauges shall be deemed to indicate the presence of a leak unless such reduction can be readily attributed to some other cause.
Where leakage or other defects are located, the affected portion of the piping system shall be repaired or replaced and retested.
Leak checks using fuel gas shall be permitted in piping systems that have been pressure tested in accordance with Section G2417.
During the process of turning gas on into a system of new gas piping, the entire system shall be inspected to determine that there are no open fittings or ends and that all valves at unused outlets are closed and plugged or capped.
Immediately after the gas is turned on into a new system or into a system that has been initially restored after an interruption of service, the piping system shall be checked for leakage. Where leakage is indicated, the gas supply shall be shut off until the necessary repairs have been made.
Appliances and equipment shall not be placed in operation until after the piping system has been checked for leakage in accordance with Section G2417.6.3, the piping system has been purged in accordance with Section G2417.7 and the connections to the appliances have been checked for leakage.
The purging of piping systems shall be in accordance with the provisions of Sections G2417.7.1.1 through G2417.7.1.4 where the piping system meets either of the following:
Where existing gas piping is opened, the section that is opened shall be isolated from the gas supply and the line pressure vented in accordance with Section G2417.7.1.3. Where gas piping meeting the criteria of Table G2417.7.1.1 is removed from service, the residual fuel gas in the piping shall be displaced with an inert gas.
Where gas piping containing air and meeting the criteria of Table G2417.7.1.1 is placed in operation, the air in the piping shall first be displaced with an inert gas. The inert gas shall then be displaced with fuel gas in accordance with Section G2417.7.1.3.
The open end of a piping system being pressure vented or purged shall discharge directly to an outdoor location. Purging operations shall comply with all of the following requirements:
- The point of discharge shall be controlled with a shutoff valve.
- The point of discharge shall be located not less than 10 feet (3048 mm) from sources of ignition, not less than 10 feet (3048 mm) from building openings and not less than 25 feet (7620 mm) from mechanical air intake openings.
- During discharge, the open point of discharge shall be continuously attended and monitored with a combustible gas indicator that complies with Section G2417.7.1.4.
- Purging operations introducing fuel gas shall be stopped when 90 percent fuel gas by volume is detected within the pipe.
- Persons not involved in the purging operations shall be evacuated from all areas within 10 feet (3048 mm) of the point of discharge.
Combustible gas indicators shall be listed and shall be calibrated in accordance with the manufacturer's instructions. Combustible gas indicators shall numerically display a volume scale from zero percent to 100 percent in 1-percent or smaller increments.
The purging of piping systems shall be in accordance with the provisions of Section G2417.7.2.1 where the piping system meets both of the following:
The piping system shall be purged in accordance with one or more of the following:
- The piping shall be purged with fuel gas and shall discharge to the outdoors.
- The piping shall be purged with fuel gas and shall discharge to the indoors or outdoors through an appliance burner not located in a combustion chamber. Such burner shall be provided with a continuous source of ignition.
- The piping shall be purged with fuel gas and shall discharge to the indoors or outdoors through a burner that has a continuous source of ignition and that is designed for such purpose.
- The piping shall be purged with fuel gas that is discharged to the indoors or outdoors, and the point of discharge shall be monitored with a listed combustible gas detector in accordance with Section G2417.7.2.2. Purging shall be stopped when fuel gas is detected.
- The piping shall be purged by the gas supplier in accordance with written procedures.
Combustible gas detectors shall be listed and shall be calibrated or tested in accordance with the manufacturer's instructions. Combustible gas detectors shall be capable of indicating the presence of fuel gas.
After the piping system has been placed in operation, appliances and equipment shall be purged before being placed into operation.
Piping shall be provided with support in accordance with Section G2418.2.
Piping shall be supported with metal pipe hooks, metal pipe straps, metal bands, metal brackets, metal hangers or building structural components suitable for the size of piping, of adequate strength and quality, and located at intervals so as to prevent or damp out excessive vibration. Piping shall be anchored to prevent undue strains on connected appliances and shall not be supported by other piping. Pipe hangers and supports shall conform to the requirements of MSS SP-58 and shall be spaced in accordance with Section G2424. Supports, hangers and anchors shall be installed so as not to interfere with the free expansion and contraction of the piping between anchors. The components of the supporting equipment shall be designed and installed so that they will not be disengaged by movement of the supported piping.
Where wet gas exists, a drip shall be provided at any point in the line of pipe where condensate could collect. A drip shall be provided at the outlet of the meter and shall be installed so as to constitute a trap wherein an accumulation of condensate will shut off the flow of gas before the condensate will run back into the meter.
Drips shall be provided with ready access to permit cleaning or emptying. A drip shall not be located where the condensate is subject to freezing.
Where a sediment trap is not incorporated as part of the appliance, a sediment trap shall be installed downstream of the appliance shutoff valve as close to the inlet of the appliance as practical. The sediment trap shall be either a tee fitting having a capped nipple of any length installed vertically in the bottommost opening of the tee as illustrated in Figure G2419.4 or other device approved as an effective sediment trap. Illuminating appliances, ranges, clothes dryers, decorative vented appliances for installation in vented fireplaces, gas fireplaces and outdoor grills need not be so equipped.
FIGURE G2419.4 (408.4)
METHOD OF INSTALLING A TEE FITTING SEDIMENT TRAP
Piping systems shall be provided with shutoff valves in accordance with this section.
Shutoff valves shall be of an approved type; shall be constructed of materials compatible with the piping; and shall comply with the standard that is applicable for the pressure and application, in accordance with Table G2420.1.1.
TABLE G2420.1.1 (409.1.1)
MANUAL GAS VALVE STANDARDS
| VALVE STANDARDS | APPLIANCE SHUTOFF VALVE APPLICATION UP TO1/2 psig PRESSURE | OTHER VALVE APPLICATIONS | |||
| UP TO 1/2 psig PRESSURE | UP TO 2 psig PRESSURE | UP TO 5 psig PRESSURE | UP TO 125 psig PRESSURE | ||
| ANSI Z21.15/CSA 9.1 | X | — | — | — | — |
| ASME B16.44 | X | X | Xa | Xb | — |
| ASME B16.33 | X | X | X | X | X |
In a common system serving more than one building, shutoff valves shall be installed outdoors at each building.
Each appliance shall be provided with a shutoff valve in accordance with Section G2420.5.1, G2420.5.2 or G2420.5.3.
The shutoff valve shall be located in the same room as the appliance. The shutoff valve shall be within 6 feet (1829 mm) of the appliance, and shall be installed upstream of the union, connector or quick disconnect device it serves. Such shutoff valves shall be provided with access. Shutoff valves serving movable appliances, such as cooking appliances and clothes dryers, shall be considered to be provided with access where installed behind such appliances. Appliance shutoff valves located in the firebox of a fireplace shall be installed in accordance with the appliance manufacturer's instructions.
UpCodes Diagrams (2)
Shutoff valves for vented decorative appliances, room heaters and decorative appliances for installation in vented fireplaces shall be permitted to be installed in an area remote from the appliances where such valves are provided with ready access. Such valves shall be permanently identified and shall not serve another appliance. The piping from the shutoff valve to within 6 feet (1829 mm) of the appliance shall be designed, sized and installed in accordance with Sections G2412 through G2419.
UpCodes Diagrams (2)
Where the appliance shutoff valve is installed at a manifold, such shutoff valve shall be located within 50 feet (15 240 mm) of the appliance served and shall be readily accessible and permanently identified. The piping from the manifold to within 6 feet (1829 mm) of the appliance shall be designed, sized and installed in accordance with Sections G2412 through G2419.
A line pressure regulator shall be installed where the appliance is designed to operate at a lower pressure than the supply pressure. Line gas pressure regulators shall be listed as complying with ANSI Z21.80. Access shall be provided to pressure regulators. Pressure regulators shall be protected from physical damage. Regulators installed on the exterior of the building shall be approved for outdoor installation.
MP pressure regulators shall comply with the following:
- The MP regulator shall be approved and shall be suitable for the inlet and outlet gas pressures for the application.
- The MP regulator shall maintain a reduced outlet pressure under lock-up (no-flow) conditions.
- The capacity of the MP regulator, determined by published ratings of its manufacturer, shall be adequate to supply the appliances served.
- The MP pressure regulator shall be provided with access. Where located indoors, the regulator shall be vented to the outdoors or shall be equipped with a leak-limiting device, in either case complying with Section G2421.3.
- A tee fitting with one opening capped or plugged shall be installed between the MP regulator and its upstream shutoff valve. Such tee fitting shall be positioned to allow connection of a pressure-measuring instrument and to serve as a sediment trap.
- A tee fitting with one opening capped or plugged shall be installed not less than 10 pipe diameters downstream of the MP regulator outlet. Such tee fitting shall be positioned to allow connection of a pressure-measuring instrument. The tee fitting is not required where the MP regulator serves an appliance that has a pressure test port on the gas control inlet side and the appliance is located in the same room as the MP regulator.
- Where connected to rigid piping, a union shall be installed within 1 foot (304 mm) of either side of the MP regulator.
Pressure regulators that require a vent shall be vented directly to the outdoors. The vent shall be designed to prevent the entry of insects, water and foreign objects.
Exception: A vent to the outdoors is not required for regulators equipped with and labeled for utilization with an approved vent-limiting device installed in accordance with the manufacturer's instructions.
Vent piping for relief vents and breather vents shall be constructed of materials allowed for gas piping in accordance with Section G2414. Vent piping shall be not smaller than the vent connection on the pressure-regulating device. Vent piping serving relief vents and combination relief and breather vents shall be run independently to the outdoors and shall serve only a single device vent. Vent piping serving only breather vents is permitted to be connected in a manifold arrangement where sized in accordance with an approved design that minimizes backpressure in the event of diaphragm rupture. Regulator vent piping shall not exceed the length specified in the regulator manufacturer's instructions.
Where automatic excess flow valves are installed, they shall be listed in accordance with ANSI Z21.93/CSA 6.30 and shall be sized and installed in accordance with the manufacturer's instructions.
Where fuel gas is used with oxygen in any hot work operation, a listed protective device that serves as a combination flashback arrestor and backflow check valve shall be installed at an approved location on both the fuel gas and oxygen supply lines. Where the pressure of the piped fuel gas supply is insufficient to ensure such safe operation, approved equipment shall be installed between the gas meter and the appliance that increases pressure to the level required for such safe operation.
Appliances shall be connected to the piping system by one of the following:
- Rigid metallic pipe and fittings.
- Corrugated stainless steel tubing (CSST) where installed in accordance with the manufacturer's instructions.
- Listed and labeled appliance connectors in compliance with ANSI Z21.24/CSA 6.10 and installed in accordance with the manufacturer's instructions and located entirely in the same room as the appliance.
- Listed and labeled quick-disconnect devices in compliance with ANSI Z21.41/CSA 6.9 used in conjunction with listed and labeled appliance connectors.
- Listed and labeled convenience outlets in compliance with ANSI Z21.90/CSA 6.24 used in conjunction with listed and labeled appliance connectors.
- Listed and labeled outdoor appliance connectors in compliance with ANSI Z21.75/CSA 6.27 and installed in accordance with the manufacturer's instructions.
- Listed outdoor gas hose connectors in compliance with ANSI Z21.54 used to connect portable outdoor appliances. The gas hose connection shall be made only in the outdoor area where the appliance is used, and shall be to the gas piping supply at an appliance shutoff valve, a listed quick-disconnect device or listed gas convenience outlet.
Connectors and tubing shall be installed so as to be protected against physical damage.
Appliance fuel connectors shall be installed in accordance with the manufacturer's instructions and Sections G2422.1.2.1 through G2422.1.2.4.
Connectors shall have an overall length not to exceed 6 feet (1829 mm). Measurement shall be made along the centerline of the connector. Only one connector shall be used for each appliance.
Exception: Rigid metallic piping used to connect an appliance to the piping system shall be permitted to have a total length greater than 6 feet (1829 mm), provided that the connecting pipe is sized as part of the piping system in accordance with Section G2413 and the location of the appliance shutoff valve complies with Section G2420.5.
Connectors shall not be concealed within, or extended through, walls, floors, partitions, ceilings or appliance housings.
Exceptions:
- Connectors constructed of materials allowed for piping systems in accordance with Section G2414 shall be permitted to pass through walls, floors, partitions and ceilings where installed in accordance with Section G2420.5.2 or G2420.5.3.
- Rigid steel pipe connectors shall be permitted to extend through openings in appliance housings.
- Fireplace inserts that are factory equipped with grommets, sleeves or other means of protection in accordance with the listing of the appliance.
- Semirigid tubing and listed connectors shall be permitted to extend through an opening in an appliance housing, cabinet or casing where the tubing or connector is protected against damage.
A shutoff valve not less than the nominal size of the connector shall be installed ahead of the connector in accordance with Section G2420.5.
Internal combustion engines shall not be rigidly connected to the gas supply piping.
A union fitting shall be provided for appliances connected by rigid metallic pipe. Such unions shall be accessible and located within 6 feet (1829 mm) of the appliance.
Where appliances are equipped with casters or are otherwise subject to periodic movement or relocation for purposes such as routine cleaning and maintenance, such appliances shall be connected to the supply system piping by means of an appliance connector listed as complying with ANSI Z21.69/CSA 6.16 or by means of Item 1 of Section G2422.1. Such flexible connectors shall be installed and protected against physical damage in accordance with the manufacturer's instructions.
Suspended low-intensity infrared tube heaters shall be connected to the building piping system with a connector listed for the application complying with ANSI Z21.24/CSA 6.10. The connector shall be installed as specified by the tube heater manufacturer's instructions.
Motor fuel-dispensing facilities for CNG fuel shall be in accordance with Section 413 of the Florida Building Code, Fuel Gas.
Piping shall be supported at intervals not exceeding the spacing specified in Table G2424.1. Spacing of supports for CSST shall be in accordance with the CSST manufacturer's instructions.
TABLE G2424.1 (415.1)
SUPPORT OF PIPING
| STEEL PIPE, NOMINAL SIZE OF PIPE (inches) | SPACING OF (feet) | NOMINAL SIZE OF TUBING SMOOTH-WALL (inch O.D.) | SPACING OF (feet) |
| 1/2 | 6 | 1/2 | 4 |
| 3/4 or 1 | 8 | 5/8 or 3/4 | 6 |
| 11/4 or larger (horizontal) | 10 | 7/8 or 1 (horizontal) | 8 |
| 11/4 or larger (vertical) | Every floor level | 1 or larger (vertical) | Every floor level |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
This section shall govern the installation, maintenance, repair and approval of factory-built chimneys, chimney liners, vents and connectors and the utilization of masonry chimneys serving gas-fired appliances.
Every appliance shall discharge the products of combustion to the outdoors, except for appliances exempted by Section G2425.8.
Where an appliance equipped with a mechanical forced draft system creates a positive pressure in the venting system, the venting system shall be designed for positive pressure applications.
Connection of appliances to chimney flues serving fireplaces shall be in accordance with Sections G2425.7.1 through G2425.7.3.
An appliance shall not be connected to a flue serving a factory-built fireplace unless the appliance is specifically listed for such installation. The connection shall be made in accordance with the appliance manufacturer's installation instructions.
A connector shall extend from the appliance to the flue serving a masonry fireplace such that the flue gases are exhausted directly into the flue. The connector shall be accessible or removable for inspection and cleaning of both the connector and the flue. Listed direct connection devices shall be installed in accordance with their listing.
The following appliances shall not be required to be vented:
- Ranges.
- Built-in domestic cooking units listed and marked for optional venting.
- Hot plates and laundry stoves.
- Type 1 clothes dryers (Type 1 clothes dryers shall be exhausted in accordance with the requirements of Section G2439).
- Refrigerators.
- Counter appliances.
- Room heaters listed for unvented use.
Where the appliances listed in Items 5 through 7 are installed so that the aggregate input rating exceeds 20 Btu per hour per cubic foot (207 W/m3) of volume of the room or space in which such appliances are installed, one or more shall be provided with venting systems or other approved means for conveying the vent gases to the outdoor atmosphere so that the aggregate input rating of the remaining unvented appliances does not exceed 20 Btu per hour per cubic foot (207 W/m3). Where the room or space in which the appliance is installed is directly connected to another room or space by a doorway, archway or other opening of comparable size that cannot be closed, the volume of such adjacent room or space shall be permitted to be included in the calculations.
Connectors shall connect to a masonry chimney flue at a point not less than 12 inches (305 mm) above the lowest portion of the interior of the chimney flue.
Appliance connections to a chimney or vent equipped with a power exhauster shall be made on the inlet side of the exhauster. Joints on the positive pressure side of the exhauster shall be sealed to prevent flue-gas leakage as specified by the manufacturer's installation instructions for the exhauster.
Masonry chimneys utilized to vent appliances shall be located, constructed and sized as specified in the manufacturer's installation instructions for the appliances being vented and Section G2427.
Flue lining systems for use with residential-type and low-heat appliances shall be limited to the following:
- Clay flue lining complying with the requirements of ASTM C315 or equivalent. Clay flue lining shall be installed in accordance with Chapter 10.
- Listed chimney lining systems complying with UL 1777.
- Other approved materials that will resist, without cracking, softening or corrosion, flue gases and condensate at temperatures up to 1,800°F (982°C).
- Flue lining systems complying with Section G2425.12.
- Chimney lining systems listed and labeled for use with gas appliances with draft hoods and other Category I gas appliances listed and labeled for use with Type B vents.
The design, sizing and installation of vents for Category II, III and IV appliances shall be in accordance with the appliance manufacturer's instructions.
Where an appliance is permanently disconnected from an existing chimney or vent, or where an appliance is connected to an existing chimney or vent during the process of a new installation, the chimney or vent shall comply with Sections G2425.15.1 through G2425.15.4.
The chimney or vent shall be resized as necessary to control flue gas condensation in the interior of the chimney or vent and to provide the appliance or appliances served with the required draft. For Category I appliances, the resizing shall be in accordance with Section G2426.
The flue gas passageway shall be free of obstructions and combustible deposits and shall be cleaned if previously used for venting a solid or liquid fuel-burning appliance or fireplace. The flue liner, chimney inner wall or vent inner wall shall be continuous and shall be free of cracks, gaps, perforations, or other damage or deterioration that would allow the escape of combustion products, including gases, moisture and creosote.
Masonry chimney flues shall be provided with a cleanout opening having a minimum height of 6 inches (152 mm). The upper edge of the opening shall be located not less than 6 inches (152 mm) below the lowest chimney inlet opening. The cleanout shall be provided with a tight-fitting, noncombustible cover.
Chimneys and vents shall have airspace clearance to combustibles in accordance with Chapter 10 and the chimney or vent manufacturer's installation instructions.
Exception: Masonry chimneys without the required airspace clearances shall be permitted to be used if lined or relined with a chimney lining system listed for use in chimneys with reduced clearances in accordance with UL 1777. The chimney clearance shall be not less than permitted by the terms of the chimney liner listing and the manufacturer's instructions.
Noncombustible fireblocking shall be provided in accordance with Chapter 10.
Vents, except as provided in Section G2427.7, shall be listed and labeled. Type B and BW vents shall be tested in accordance with UL 441. Type L vents shall be tested in accordance with UL 641. Vents for Category II and III appliances shall be tested in accordance with UL 1738. Plastic vents for Category IV appliances shall not be required to be listed and labeled where such vents are as specified by the appliance manufacturer and are installed in accordance with the appliance manufacturer's instructions.
Connectors shall be used to connect appliances to the vertical chimney or vent, except where the chimney or vent is attached directly to the appliance. Vent connector size, material, construction and installation shall be in accordance with Section G2427.
The application of vents shall be in accordance with Table G2427.4.
Where vents pass through insulated assemblies, an insulation shield constructed of steel having a minimum thickness of 0.0187 inch (0.4712 mm) (No. 26 gage) shall be installed to provide clearance between the vent and the insulation material. The clearance shall be not less than the clearance to combustibles specified by the vent manufacturer's installation instructions. Where vents pass through attic space, the shield shall terminate not less than 2 inches (51 mm) above the insulation materials and shall be secured in place to prevent displacement. Insulation shields provided as part of a listed vent system shall be installed in accordance with the manufacturer's instructions.
Vent systems shall be sized, installed and terminated in accordance with the vent and appliance manufacturer's installation instructions and Section G2427.
All portions of vents shall be adequately supported for the design and weight of the materials employed.
In concealed locations, where a vent is installed through holes or notches in studs, joists, rafters or similar members less than 11/2 inches (38 mm) from the nearest edge of the member, the vent shall be protected by shield plates. Protective steel shield plates having a minimum thickness of 0.0575-inch (1.463 mm) (No. 16 gage) shall cover the area of the vent where the member is notched or bored and shall extend not less than 4 inches (102 mm) above sole plates, below top plates and to each side of a stud, joist or rafter.
Except as permitted in Sections G2425.8, G2427.2.1 and G2427.2.2, all appliances shall be connected to venting systems.
Listed direct-vent appliances shall be installed in accordance with the manufacturer's instructions. Through-the-wall vent terminations for listed direct-vent appliances shall be in accordance with Section G2427.8.
Appliances incorporating integral venting means shall be installed in accordance with Section G2427.8.
Venting systems shall be designed and constructed so as to convey all flue and vent gases to the outdoors.
A venting system shall satisfy the draft requirements of the appliance in accordance with the manufacturer's instructions.
Appliances required to be vented shall be connected to a venting system designed and installed in accordance with the provisions of Sections G2427.4 through G2427.16.
Mechanical draft systems shall comply with the following:
- Mechanical draft systems shall be listed in accordance with UL 378 and shall be installed in accordance with the manufacturer's instructions for both the appliance and the mechanical draft system.
- Appliances requiring venting shall be permitted to be vented by means of mechanical draft systems of either forced or induced draft design.
- Forced draft systems and all portions of induced draft systems under positive pressure during operation shall be designed and installed so as to prevent leakage of flue or vent gases into a building.
- Vent connectors serving appliances vented by natural draft shall not be connected into any portion of mechanical draft systems operating under positive pressure.
- Where a mechanical draft system is employed, provisions shall be made to prevent the flow of gas to the main burners when the draft system is not performing so as to satisfy the operating requirements of the appliance for safe performance.
Venting systems shall not extend into or pass through any fabricated air duct or furnace plenum.
Where a venting system passes through an above-ceiling air-handling space or other nonducted portion of an air-handling system, the venting system shall conform to one of the following requirements:
- The venting system shall be a listed special gas vent; other venting system serving a Category III or Category IV appliance; or other positive pressure vent, with joints sealed in accordance with the appliance or vent manufacturer's instructions.
- The venting system shall be installed such that fittings and joints between sections are not installed in the above-ceiling space.
- The venting system shall be installed in a conduit or enclosure with sealed joints separating the interior of the conduit or enclosure from the ceiling space.
The type of venting system to be used shall be in accordance with Table G2427.4.
TABLE G2427.4 (503.4)
TYPE OF VENTING SYSTEM TO BE USED
| APPLIANCES | TYPE OF VENTING SYSTEM |
| Listed Category I appliances Listed appliances equipped with draft hood Appliances listed for use with Type B gas vent | Type B gas vent (Section G2427.6) Single-wall metal pipe (Section G2427.7) Special gas vent listed for these appliances (Section G2427.4.2) |
| Listed vented wall furnaces | Type B-W gas vent (Sections G2427.6, G2436) |
| Category II, Category III and Category IV appliances | As specified or furnished by manufacturers of listed appliances |
| Unlisted appliances | Chimney (Section G2427.5) |
| Decorative appliances in vented fireplaces | Chimney |
| Direct-vent appliances | See Section G2427.2.1 |
| Appliances with integral vent | See Section G2427.2.2 |
Where plastic piping is used to vent an appliance, the appliance shall be listed for use with such venting materials and the appliance manufacturer's installation instructions shall identify the specific plastic piping material. The plastic pipe venting materials shall be labeled in accordance with the product standards specified by the appliance manufacturer or shall be listed in accordance with UL 1738.
Plastic pipe and fittings used to vent appliances shall be installed in accordance with the appliance manufacturer's instructions. Plastic pipe venting materials listed and labeled in accordance with UL 1738 shall be installed in accordance with the vent manufacturer's instructions. Where a primer is required, it shall be of a contrasting color.
Special gas vent shall be listed and labeled in accordance with UL 1738 and installed in accordance with the special gas vent manufacturer's instructions.
Factory-built chimneys shall be listed in accordance with UL 103. Factory-built chimneys used to vent appliances that operate at a positive vent pressure shall be listed for such application.
Masonry chimneys shall be built and installed in accordance with NFPA 211 and shall be lined with an approved clay flue lining, a chimney lining system listed and labeled in accordance with UL 1777 or other approved material that will resist corrosion, erosion, softening or cracking from vent gases at temperatures up to 1,800°F (982°C).
Exception: Masonry chimney flues serving listed gas appliances with draft hoods, Category I appliances and other gas appliances listed for use with Type B vents shall be permitted to be lined with a chimney lining system specifically listed for use only with such appliances. The liner shall be installed in accordance with the liner manufacturer's instructions. A permanent identifying label shall be attached at the point where the connection is to be made to the liner. The label shall read: "This chimney liner is for appliances that burn gas only. Do not connect to solid or liquid fuel-burning appliances or incinerators."
Chimneys for residential-type or low-heat appliances shall extend not less than 3 feet (914 mm) above the highest point where they pass through a roof of a building and not less than 2 feet (610 mm) higher than any portion of a building within a horizontal distance of 10 feet (3048 mm). Chimneys for medium-heat appliances shall extend not less than 10 feet (3048 mm) higher than any portion of any building within 25 feet (7620 mm). Chimneys shall extend not less than 5 feet (1524 mm) above the highest connected appliance draft hood outlet or flue collar. Decorative shrouds shall not be installed at the termination of factory-built chimneys except where such shrouds are listed and labeled for use with the specific factory-built chimney system and are installed in accordance with the manufacturer's instructions.
The effective area of a chimney venting system serving listed appliances with draft hoods, Category I appliances, and other appliances listed for use with Type B vents shall be determined in accordance with one of the following methods:
- The provisions of Section G2428.
- The effective areas of the vent connector and chimney flue of a venting system serving a single appliance with a draft hood shall be not less than the area of the appliance flue collar or draft hood outlet, nor greater than seven times the draft hood outlet area.
- The effective area of the chimney flue or a venting system serving two appliances with draft hoods shall be not less than the area of the larger draft hood outlet plus 50 percent of the area of the smaller draft hood outlet, nor greater than seven times the smallest draft hood outlet area.
- Chimney venting systems using mechanical draft shall be sized in accordance with approved engineering methods.
- Other approved engineering methods.
Before replacing an existing appliance or connecting a vent connector to a chimney, the chimney passageway shall be examined to ascertain that it is clear and free of obstructions and it shall be cleaned if previously used for venting solid or liquid fuel-burning appliances or fireplaces.
Chimneys shall be lined in accordance with NFPA 211.
Cleanouts shall be examined and where they do not remain tightly closed when not in use, they shall be repaired or replaced.
Where inspection reveals that an existing chimney is not safe for the intended application, it shall be repaired, rebuilt, lined, relined or replaced with a vent or chimney to conform to NFPA 211 and it shall be suitable for the appliances to be vented.
Chimneys serving appliances burning other fuels shall comply with Sections G2427.5.6.1 through G2427.5.6.4.
Where one chimney flue serves gas appliances and liquid fuel-burning appliances, the appliances shall be connected through separate openings or shall be connected through a single opening where joined by a suitable fitting located as close as practical to the chimney. Where two or more openings are provided into one chimney flue, they shall be at different levels. Where the appliances are automatically controlled, they shall be equipped with safety shutoff devices.
A combination gas- and solid fuel-burning appliance shall be permitted to be connected to a single chimney flue where equipped with a manual reset device to shut off gas to the main burner in the event of sustained backdraft or flue gas spillage. The chimney flue shall be sized to properly vent the appliance.
All portions of chimneys shall be supported for the design and weight of the materials employed. Factory-built chimneys shall be supported and spaced in accordance with the manufacturer's installation instructions.
Where a chimney that formerly carried flue products from liquid or solid fuel-burning appliances is used with an appliance using fuel gas, an accessible cleanout shall be provided. The cleanout shall have a tight-fitting cover and be installed so its upper edge is not less than 6 inches (152 mm) below the lower edge of the lowest chimney inlet opening.
The remaining space surrounding a chimney liner, gas vent, special gas vent or plastic piping installed within a masonry chimney flue shall not be used to vent another appliance. The insertion of another liner or vent within the chimney as provided in this code and the liner or vent manufacturer's instructions shall not be prohibited.
The remaining space surrounding a chimney liner, gas vent, special gas vent or plastic piping installed within a masonry, metal or factory-built chimney shall not be used to supply combustion air. Such space shall not be prohibited from supplying combustion air to direct-vent appliances designed for installation in a solid fuel-burning fireplace and installed in accordance with the manufacturer's instructions.
Where a factory-built chimney passes through insulated assemblies, an insulation shield constructed of steel having a thickness of not less than 0.0187 inch (0.475 mm) (nominal 26 gage) shall be installed to provide clearance between the chimney and the insulation material. The clearance shall be not less than the clearance to combustibles specified by the chimney manufacturer's installation instructions. Where chimneys pass through attic space, the shield shall terminate not less than 2 inches (51 mm) above the installation materials and shall be secured in place to prevent displacement.
Gas vents shall comply with Sections G2427.6.1 through G2427.6.12. (See Section G2403, General Definitions.)
Type B and BW gas vents shall be listed in accordance with UL 441. Vents for listed combination gas- and oil-burning appliances shall be listed in accordance with UL 641.
Gas vents shall be installed in accordance with the manufacturer's instructions.
A Type B-W gas vent shall have a listed capacity not less than that of the listed vented wall furnace to which it is connected.
A gas vent shall terminate in accordance with one of the following:
- Gas vents that are 12 inches (305 mm) or less in size and located not less than 8 feet (2438 mm) from a vertical wall or similar obstruction shall terminate above the roof in accordance with Figure G2427.6.4.
- Gas vents that are over 12 inches (305 mm) in size or are located less than 8 feet (2438 mm) from a vertical wall or similar obstruction shall terminate not less than 2 feet (610 mm) above the highest point where they pass through the roof and not less than 2 feet (610 mm) above any portion of a building within 10 feet (3048 mm) horizontally.
- As provided for direct-vent systems in Section G2427.2.1.
- As provided for appliances with integral vents in Section G2427.2.2.
- As provided for mechanical draft systems in Section G2427.3.3.
| ROOF SLOPE | H (minimum) ft |
|---|---|
| Flat to 6/12 | 1.0 |
| Over 6/12 to 7/12 | 1.25 |
| Over 7/12 to 8/12 | 1.5 |
| Over 8/12 to 9/12 | 2.0 |
| Over 9/12 to 10/12 | 2.5 |
| Over 10/12 to 11/12 | 3.25 |
| Over 11/12 to 12/12 | 4.0 |
| Over 12/12 to 14/12 | 5.0 |
| Over 14/12 to 16/12 | 6.0 |
| Over 16/12 to 18/12 | 7.0 |
| Over 18/12 to 20/12 | 7.5 |
| Over 20/12 to 21/12 | 8.0 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
FIGURE G2427.6.4 (503.6.5)
TERMINATION LOCATIONS FOR GAS VENTS WITH LISTED CAPS 12 INCHES OR LESS IN SIZE NOT LESS THAN 8 FEET FROM A VERTICAL WALL
UpCodes Diagram (1)
Decorative shrouds shall not be installed at the termination of gas vents except where such shrouds are listed for use with the specific gas venting system and are installed in accordance with manufacturer's instructions.
A Type B or L gas vent shall terminate not less than 5 feet (1524 mm) in vertical height above the highest connected appliance draft hood or flue collar. A Type B-W gas vent shall terminate not less than 12 feet (3658 mm) in vertical height above the bottom of the wall furnace.
Gas vents shall extend through the roof flashing, roof jack or roof thimble and terminate with a listed cap or listed roof assembly.
Gas vents shall terminate not less than 3 feet (914 mm) above any forced air inlet located within 10 feet (3048 mm).
A gas vent extending through an exterior wall shall not terminate adjacent to the wall or below eaves or parapets, except as provided in Sections G2427.2.1 and G2427.3.3.
Venting systems shall be sized and constructed in accordance with Sections G2427.6.9.1 through G2427.6.9.4 and the appliance manufacturer's installation instructions.
The sizing of natural draft venting systems serving one or more listed appliances equipped with a draft hood or appliances listed for use with Type B gas vent, installed in a single story of a building, shall be in accordance with one of the following methods:
- The provisions of Section G2428.
- For sizing an individual gas vent for a single, draft hood-equipped appliance, the effective area of the vent connector and the gas vent shall be not less than the area of the appliance draft hood outlet, nor greater than seven times the draft hood outlet area.
- For sizing a gas vent connected to two appliances with draft hoods, the effective area of the vent shall be not less than the area of the larger draft hood outlet plus 50 percent of the area of the smaller draft hood outlet, nor greater than seven times the smaller draft hood outlet area.
- Approved engineering methods.
Type B and L vents sized in accordance with Item 2 or 3 of Section G2427.6.9.1 shall extend in a generally vertical direction with offsets not exceeding 45 degrees (0.79 rad), except that a vent system having not more than one 60-degree (1.04 rad) offset shall be permitted. Any angle greater than 45 degrees (0.79 rad) from the vertical is considered horizontal. The total horizontal distance of a vent plus the horizontal vent connector serving draft hood-equipped appliances shall be not greater than 75 percent of the vertical height of the vent.
The sizing of gas vents for Category II, III and IV appliances shall be in accordance with the appliance manufacturer's instructions. The sizing of plastic pipe that is specified by the appliance manufacturer as a venting material for Category II, III and IV appliances, shall be in accordance with the manufacturer's instructions.
Chimney venting systems using mechanical draft shall be sized in accordance with approved engineering methods.
Gas vents shall be supported and spaced in accordance with the manufacturer's installation instructions.
In those localities where solid and liquid fuels are used extensively, gas vents shall be permanently identified by a label attached to the wall or ceiling at a point where the vent connector enters the gas vent. The determination of where such localities exist shall be made by the code official. The label shall read:
"This gas vent is for appliances that burn gas. Do not connect to solid or liquid fuel-burning appliances or incinerators."
Uninsulated single-wall metal pipe shall not be used outdoors for venting appliances in regions where the 99-percent winter design temperature is below 32°F (0°C).
Single-wall metal pipe shall terminate not less than 5 feet (1524 mm) in vertical height above the highest connected appliance draft hood outlet or flue collar. Single-wall metal pipe shall extend not less than 2 feet (610 mm) above the highest point where it passes through a roof of a building and not less than 2 feet (610 mm) higher than any portion of a building within a horizontal distance of 10 feet (3048 mm). An approved cap or roof assembly shall be attached to the terminus of a single-wall metal pipe.
Single-wall metal pipe shall be used only for runs directly from the space in which the appliance is located through the roof or exterior wall to the outdoor atmosphere.
A pipe passing through a roof shall extend without interruption through the roof flashing, roof jack or roof thimble. Where a single-wall metal pipe passes through a roof constructed of combustible material, a noncombustible, nonventilating thimble shall be used at the point of passage. The thimble shall extend not less than 18 inches (457 mm) above and 6 inches (152 mm) below the roof with the annular space open at the bottom and closed only at the top. The thimble shall be sized in accordance with Section G2427.7.7.
A single-wall metal pipe shall not pass through a combustible exterior wall unless guarded at the point of passage by a ventilated metal thimble not smaller than the following:
- For listed appliances with draft hoods and appliances listed for use with Type B gas vents, the thimble shall be not less than 4 inches (102 mm) larger in diameter than the metal pipe. Where there is a run of not less than 6 feet (1829 mm) of metal pipe in the open between the draft hood outlet and the thimble, the thimble shall be permitted to be not less than 2 inches (51 mm) larger in diameter than the metal pipe.
- For unlisted appliances having draft hoods, the thimble shall be not less than 6 inches (152 mm) larger in diameter than the metal pipe.
- For residential and low-heat appliances, the thimble shall be not less than 12 inches (305 mm) larger in diameter than the metal pipe.
Exception: In lieu of thimble protection, all combustible material in the wall shall be removed a sufficient distance from the metal pipe to provide the specified clearance from such metal pipe to combustible material. Any material used to close up such opening shall be noncombustible.
Minimum clearances from single-wall metal pipe to combustible material shall be in accordance with Table G2427.10.5. The clearance from single-wall metal pipe to combustible material shall be permitted to be reduced where the combustible material is protected as specified for vent connectors in Table G2409.2.
A venting system constructed of single-wall metal pipe shall be sized in accordance with one of the following methods and the appliance manufacturer's instructions:
- For a draft hood-equipped appliance, in accordance with Section G2428.
- For a venting system for a single appliance with a draft hood, the areas of the connector and the pipe each shall be not less than the area of the appliance flue collar or draft hood outlet, whichever is smaller. The vent area shall be not greater than seven times the draft hood outlet area.
- Approved engineering methods.
The vent cap or a roof assembly shall have a venting capacity of not less than that of the pipe to which it is attached.
Single-wall metal pipe shall comply with the marking provisions of Section G2427.6.11.
The clearances for through-the-wall direct-vent and nondirect-vent terminals shall be in accordance with Figure G2427.8 and Table G2427.8.
Exception: The clearances in Table G2427.8 shall not apply to the combustion air intake of a direct-vent appliance.
FIGURE G2427.8 (503.8)
THROUGH-THE-WALL VENT TERMINAL CLEARANCES
TABLE G2427.8 (503.8)
THROUGH-THE-WALL VENT TERMINAL CLEARANCES
| FIGURE | CLEARANCE LOCATION | MINIMUM CLEARANCES FOR DIRECT-VENT TERMINALS | MINIMUM CLEARANCES FOR NONDIRECT-VENT TERMINALS | |
| A | Clearance above finished grade level, veranda, porch, deck or balcony | 12 inches | ||
| B | Clearance to window or door that is openable | 6 inches: Appliances ≤ 10,000 Btu/hr 9 inches: Appliances > 10,000 Btu/hr ≤ 50,000 Btu/hr 12 inches: Appliances > 50,000 Btu/hr ≤ 150,000 Btu/hr Appliances > 150,000 Btu/hr, in accordance with the appliance manufacturer's instructions and not less than the clearances specified for nondirect-vent terminals in Row B | 4 feet below or to side of opening or 1 foot above opening | |
| C | Clearance to nonopenable window | None unless otherwise specified by the appliance manufacturer | ||
| D | Vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 2 feet from the centerline of the terminal | None unless otherwise specified by the appliance manufacturer | ||
| E | Clearance to unventilated soffit | None unless otherwise specified by the appliance manufacturer | ||
| F | Clearance to outside corner of building | None unless otherwise specified by the appliance manufacturer | ||
| G | Clearance to inside corner of building | None unless otherwise specified by the appliance manufacturer | ||
| H | Clearance to each side of centerline extended above regulator vent outlet | 3 feet up to a height of 15 feet above the regulator vent outlet | ||
| I | Clearance to service regulator vent outlet in all directions | 3 feet for gas pressures up to 2 psi; 10 feet for gas pressures above 2 psi | ||
| J | Clearance to nonmechanical air supply inlet to building and the combustion air inlet to any other appliance | Same clearance as specified for Row B | ||
| K | Clearance to a mechanical air supply inlet | 10 feet horizontally from inlet or 3 feet above inlet | ||
| L | Clearance above paved sidewalk or paved driveway located on public property | 7 feet and shall not be located above public walkways or other areas where condensate or vapor can cause a nuisance or hazard | ||
| M | Clearance to underside of veranda, porch deck or balcony | 12 inches where the area beneath the veranda, porch deck or balcony is open on not less than two sides. The vent terminal is prohibited in this location where only one side is open. | ||
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square inch = 6.895 kPa, 1 Btu/h = 0.293 W.
Provisions shall be made to collect and dispose of condensate from venting systems serving Category II and IV appliances and noncategorized condensing appliances. Drains for condensate shall be installed in accordance with the appliance and vent manufacturer's instructions.
Vent connectors for Category I appliances shall comply with Sections G2427.10.1 through G2427.10.14.
A vent connector shall be made of noncombustible corrosion-resistant material capable of withstanding the vent gas temperature produced by the appliance and of sufficient thickness to withstand physical damage.
Where the vent connector used for an appliance having a draft hood or a Category I appliance is located in or passes through attics, crawl spaces or other unconditioned spaces, that portion of the vent connector shall be listed Type B, Type L or listed vent material having equivalent insulation properties.
Exception: Single-wall metal pipe located within the exterior walls of the building in areas having a local 99-percent winter design temperature of 5°F (-15°C) or higher shall be permitted to be used in unconditioned spaces other than attics and crawl spaces.
Where vent connectors for residential-type appliances are not installed in attics or other unconditioned spaces, connectors for listed appliances having draft hoods, appliances having draft hoods and equipped with listed conversion burners and Category I appliances shall be one of the following:
- Type B or L vent material.
- Galvanized sheet steel not less than 0.018 inch (0.46 mm) thick.
- Aluminum (1100 or 3003 alloy or equivalent) sheet not less than 0.027 inch (0.69 mm) thick.
- Stainless steel sheet not less than 0.012 inch (0.31 mm) thick.
- Smooth interior wall metal pipe having resistance to heat and corrosion equal to or greater than that of Item 2, 3 or 4.
- A listed vent connector.
Vent connectors shall not be covered with insulation.
Exception: Listed insulated vent connectors shall be installed in accordance with the manufacturer's instructions.
A vent connector for a nonresidential, low-heat appliance shall be a factory-built chimney section or steel pipe having resistance to heat and corrosion equivalent to that for the appropriate galvanized pipe as specified in Table G2427.10.2.4. Factory-built chimney sections shall be joined together in accordance with the chimney manufacturer's instructions.
TABLE G2427.10.2.4 (503.10.2.4)
MINIMUM THICKNESS FOR GALVANIZED STEEL VENT CONNECTORS FOR LOW-HEAT APPLIANCES
| DIAMETER OF CONNECTOR (inches) | MINIMUM THICKNESS (inch) |
| Less than 6 | 0.019 |
| 6 to less than 10 | 0.023 |
| 10 to 12 inclusive | 0.029 |
| 14 to 16 inclusive | 0.034 |
| Over 16 | 0.056 |
For SI: 1 inch = 25.4 mm.
A vent connector for an appliance with a single draft hood or for a Category I fan-assisted combustion system appliance shall be sized and installed in accordance with Section G2428 or approved engineering methods.
Where a single appliance having more than one draft hood outlet or flue collar is installed, the manifold shall be constructed according to the instructions of the appliance manufacturer. Where there are no instructions, the manifold shall be designed and constructed in accordance with approved engineering methods. As an alternate method, the effective area of the manifold shall equal the combined area of the flue collars or draft hood outlets and the vent connectors shall have a rise of not less than 12 inches (305 mm).
Where two or more appliances are connected to a common vent or chimney, each vent connector shall be sized in accordance with Section G2428 or approved engineering methods.
As an alternative method applicable only where all of the appliances are draft hood equipped, each vent connector shall have an effective area not less than the area of the draft hood outlet of the appliance to which it is connected.
Where two or more appliances are vented through a common vent connector or vent manifold, the common vent connector or vent manifold shall be located at the highest level consistent with available headroom and the required clearance to combustible materials and shall be sized in accordance with Section G2428 or approved engineering methods.
As an alternate method applicable only where there are two draft hood-equipped appliances, the effective area of the common vent connector or vent manifold and all junction fittings shall be not less than the area of the larger vent connector plus 50 percent of the area of the smaller flue collar outlet.
Where the size of a vent connector is increased to overcome installation limitations and obtain connector capacity equal to the appliance input, the size increase shall be made at the appliance draft hood outlet.
Where two or more vent connectors enter a common vent, chimney flue, or single-wall metal pipe, the smaller connector shall enter at the highest level consistent with the available headroom or clearance to combustible material. Vent connectors serving Category I appliances shall not be connected to any portion of a mechanical draft system operating under positive static pressure, such as those serving Category III or IV appliances.
Minimum clearances from vent connectors to combustible material shall be in accordance with Table G2427.10.5.
Exception: The clearance between a vent connector and combustible material shall be permitted to be reduced where the combustible material is protected as specified for vent connectors in Table G2409.2.
TABLE G2427.10.5 (503.10.5)
CLEARANCES FOR CONNECTORSa
| APPLIANCE | MINIMUM DISTANCE FROM COMBUSTIBLE MATERIAL | |||
| Listed Type B gas vent material | Listed Type L vent material | Single-wall metal pipe | Factory-built chimney sections | |
| Listed appliances with draft hoods and appliances listed for use with Type B gas vents | As listed | As listed | 6 inches | As listed |
| Residential boilers and furnaces with listed gas conversion burner and with draft hood | 6 inches | 6 inches | 9 inches | As listed |
| Residential appliances listed for use with Type L vents | Not permitted | As listed | 9 inches | As listed |
| Listed gas-fired toilets | Not permitted | As listed | As listed | As listed |
| Unlisted residential appliances with draft hood | Not permitted | 6 inches | 9 inches | As listed |
| Residential and low-heat appliances other than above | Not permitted | 9 inches | 18 inches | As listed |
| Medium-heat appliances | Not permitted | Not permitted | 36 inches | As listed |
For SI: 1 inch = 25.4 mm.
- These clearances shall apply unless the manufacturer's installation instructions for a listed appliance or connector specify different clearances, in which case the listed clearances shall apply.
Joints between sections of connector piping and connections to flue collars and draft hood outlets shall be fastened by one of the following methods:
- Sheet metal screws.
- Vent connectors of listed vent material assembled and connected to flue collars or draft hood outlets in accordance with the manufacturer's instructions.
- Other approved means.
Where vent connectors are joined together, the connection shall be made with a tee or wye
A vent connector shall be installed without dips or sags and shall slope upward toward the vent or chimney not less than 1/4 inch per foot (21 mm/m).
Exception: Vent connectors attached to a mechanical draft system installed in accordance with the appliance and draft system manufacturers' instructions.
A vent connector shall be supported for the design and weight of the material employed to maintain clearances and prevent physical damage and separation of joints.
Where entering a flue in a masonry or metal chimney, the vent connector shall be installed above the extreme bottom to avoid stoppage. Where a thimble or slip joint is used to facilitate removal of the connector, the connector shall be firmly attached to or inserted into the thimble or slip joint to prevent the connector from falling out. Means shall be employed to prevent the connector from entering so far as to restrict the space between its end and the opposite wall of the chimney flue (see Section G2425.9).
The entire length of a vent connector shall be provided with ready access for inspection, cleaning and replacement.
A vent connector shall not be connected to a chimney flue serving a fireplace unless the fireplace flue opening is permanently sealed.
Single-wall metal pipe connectors shall not pass through any wall, floor or ceiling except as permitted by Section G2427.7.4.
Vent connectors for Category II, III and IV appliances shall be as specified for the venting systems in accordance with Section G2427.4.
The installation of draft hoods and draft controls shall comply with Sections G2427.12.1 through G2427.12.7.
Vented appliances shall be installed with draft hoods.
Exception: Dual oven-type combination ranges; direct-vent appliances; fan-assisted combustion system appliances; appliances requiring chimney draft for operation; single firebox boilers equipped with conversion burners with inputs greater than 400,000 Btu per hour (117 kW); appliances equipped with blast, power or pressure burners that are not listed for use with draft hoods; and appliances designed for forced venting.
A draft hood supplied with or forming a part of a listed vented appliance shall be installed without alteration, exactly as furnished and specified by the appliance manufacturer.
If a draft hood is not supplied by the appliance manufacturer where one is required, a draft hood shall be installed, shall be of a listed or approved type and, in the absence of other instructions, shall be of the same size as the appliance flue collar. Where a draft hood is required with a conversion burner, it shall be of a listed or approved type.
Where a draft control device is part of the appliance or is supplied by the appliance manufacturer, it shall be installed in accordance with the manufacturer's instructions. In the absence of manufacturer's instructions, the device shall be attached to the flue collar of the appliance or as near to the appliance as practical.
Appliances requiring a controlled chimney draft shall be permitted to be equipped with a listed double-acting barometric-draft regulator installed and adjusted in accordance with the manufacturer's instructions.
Draft hoods and barometric draft regulators shall be installed in the same room or enclosure as the appliance in such a manner as to prevent any difference in pressure between the hood or regulator and the combustion air supply.
Draft hoods and draft regulators shall be installed in the position for which they were designed with reference to the horizontal and vertical planes and shall be located so that the relief opening is not obstructed by any part of the appliance or adjacent construction. The appliance and its draft hood shall be located so that the relief opening is accessible for checking vent operation.
A draft hood shall be located so its relief opening is not less than 6 inches (152 mm) from any surface except that of the appliance it serves and the venting system to which the draft hood is connected. Where a greater or lesser clearance is indicated on the appliance label, the clearance shall be not less than that specified on the label. Such clearances shall not be reduced.
A manually operated damper shall not be placed in the vent connector for any appliance. Fixed baffles and balancing baffles shall not be classified as manually operated dampers.
Balancing baffles shall be listed in accordance with UL 378 and shall be mechanically locked in the desired position before placing the appliance in operation.
Devices that retard the flow of vent gases shall not be installed in a vent connector, chimney or vent. The following shall not be considered as obstructions:
- Draft regulators and safety controls specifically listed for installation in venting systems and installed in accordance with the manufacturer's instructions.
- Approved draft regulators and safety controls that are designed and installed in accordance with approved engineering methods.
- Listed heat reclaimers and automatically operated vent dampers installed in accordance with the manufacturer's instructions.
- Approved economizers, heat reclaimers and recuperators installed in venting systems of appliances not required to be equipped with draft hoods, provided that the appliance manufacturer's instructions cover the installation of such a device in the venting system and performance in accordance with Sections G2427.3 and G2427.3.1 is obtained.
- Vent dampers serving listed appliances installed in accordance with Sections G2428.2.1 and G2428.3.1 or approved engineering methods.
Where vents, including those for direct-vent appliances, penetrate outside walls of buildings, the annular spaces around such penetrations shall be permanently sealed using approved materials to prevent entry of combustion products into the building.
The following definitions apply to the tables in this section:
APPLIANCE CATEGORIZED VENT DIAMETER/AREA. The minimum vent area/diameter permissible for Category I appliances to maintain a nonpositive vent static pressure when tested in accordance with nationally recognized standards.
FAN + FAN. The maximum combined appliance input rating of two or more Category I fan-assisted appliances attached to the common vent.
FAN Max. The maximum input rating of a Category I fan-assisted appliance attached to a vent or connector.
FAN Min. The minimum input rating of a Category I fan-assisted appliance attached to a vent or connector.
FAN + NAT. The maximum combined appliance input rating of one or more Category I fan-assisted appliances and one or more Category I draft hood-equipped appliances attached to the common vent.
FAN-ASSISTED COMBUSTION SYSTEM. An appliance equipped with an integral mechanical means to either draw or force products of combustion through the combustion chamber or heat exchanger.
NA. Vent configuration is not allowed due to potential for condensate formation or pressurization of the venting system, or not applicable due to physical or geometric restraints.
NAT Max. The maximum input rating of a Category I draft hood-equipped appliance attached to a vent or connector.
NAT + NAT. The maximum combined appliance input rating of two or more Category I draft hood-equipped appliances attached to the common vent.
The application of Tables G2428.2(1) and G2428.2(2) shall be subject to the requirements of Sections G2428.2.1 through G2428.2.17.
TABLE G2428.2(1) [504.2(1)]
TYPE B DOUBLE-WALL GAS VENT
| Number of Appliances | Single |
| Appliance Type | Category I |
| Appliance Vent Connection | Connected directly to vent |
| HEIGHT (H) (feet) | LATERAL (L) (feet) | VENT DIAMETER—(D) inches | ||||||||||||||||||||
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | ||||||||||||||||
| APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H | ||||||||||||||||||||||
| FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | |||||||||
| Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | ||
| 6 | 0 | 0 | 78 | 46 | 0 | 152 | 86 | 0 | 251 | 141 | 0 | 375 | 205 | 0 | 524 | 285 | 0 | 698 | 370 | 0 | 897 | 470 |
| 2 | 13 | 51 | 36 | 18 | 97 | 67 | 27 | 157 | 105 | 32 | 232 | 157 | 44 | 321 | 217 | 53 | 425 | 285 | 63 | 543 | 370 | |
| 4 | 21 | 49 | 34 | 30 | 94 | 64 | 39 | 153 | 103 | 50 | 227 | 153 | 66 | 316 | 211 | 79 | 419 | 279 | 93 | 536 | 362 | |
| 6 | 25 | 46 | 32 | 36 | 91 | 61 | 47 | 149 | 100 | 59 | 223 | 149 | 78 | 310 | 205 | 93 | 413 | 273 | 110 | 530 | 354 | |
| 8 | 0 | 0 | 84 | 50 | 0 | 165 | 94 | 0 | 276 | 155 | 0 | 415 | 235 | 0 | 583 | 320 | 0 | 780 | 415 | 0 | 1,006 | 537 |
| 2 | 12 | 57 | 40 | 16 | 109 | 75 | 25 | 178 | 120 | 28 | 263 | 180 | 42 | 365 | 247 | 50 | 483 | 322 | 60 | 619 | 418 | |
| 5 | 23 | 53 | 38 | 32 | 103 | 71 | 42 | 171 | 115 | 53 | 255 | 173 | 70 | 356 | 237 | 83 | 473 | 313 | 99 | 607 | 407 | |
| 8 | 28 | 49 | 35 | 39 | 98 | 66 | 51 | 164 | 109 | 64 | 247 | 165 | 84 | 347 | 227 | 99 | 463 | 303 | 117 | 596 | 396 | |
| 10 | 0 | 0 | 88 | 53 | 0 | 175 | 100 | 0 | 295 | 166 | 0 | 447 | 255 | 0 | 631 | 345 | 0 | 847 | 450 | 0 | 1,096 | 585 |
| 2 | 12 | 61 | 42 | 17 | 118 | 81 | 23 | 194 | 129 | 26 | 289 | 195 | 40 | 402 | 273 | 48 | 533 | 355 | 57 | 684 | 457 | |
| 5 | 23 | 57 | 40 | 32 | 113 | 77 | 41 | 187 | 124 | 52 | 280 | 188 | 68 | 392 | 263 | 81 | 522 | 346 | 95 | 671 | 446 | |
| 10 | 30 | 51 | 36 | 41 | 104 | 70 | 54 | 176 | 115 | 67 | 267 | 175 | 88 | 376 | 245 | 104 | 504 | 330 | 122 | 651 | 427 | |
| 15 | 0 | 0 | 94 | 58 | 0 | 191 | 112 | 0 | 327 | 187 | 0 | 502 | 285 | 0 | 716 | 390 | 0 | 970 | 525 | 0 | 1,263 | 682 |
| 2 | 11 | 69 | 48 | 15 | 136 | 93 | 20 | 226 | 150 | 22 | 339 | 225 | 38 | 475 | 316 | 45 | 633 | 414 | 53 | 815 | 544 | |
| 5 | 22 | 65 | 45 | 30 | 130 | 87 | 39 | 219 | 142 | 49 | 330 | 217 | 64 | 463 | 300 | 76 | 620 | 403 | 90 | 800 | 529 | |
| 10 | 29 | 59 | 41 | 40 | 121 | 82 | 51 | 206 | 135 | 64 | 315 | 208 | 84 | 445 | 288 | 99 | 600 | 386 | 116 | 777 | 507 | |
| 15 | 35 | 53 | 37 | 48 | 112 | 76 | 61 | 195 | 128 | 76 | 301 | 198 | 98 | 429 | 275 | 115 | 580 | 373 | 134 | 755 | 491 | |
| 20 | 0 | 0 | 97 | 61 | 0 | 202 | 119 | 0 | 349 | 202 | 0 | 540 | 307 | 0 | 776 | 430 | 0 | 1,057 | 575 | 0 | 1,384 | 752 |
| 2 | 10 | 75 | 51 | 14 | 149 | 100 | 18 | 250 | 166 | 20 | 377 | 249 | 33 | 531 | 346 | 41 | 711 | 470 | 50 | 917 | 612 | |
| 5 | 21 | 71 | 48 | 29 | 143 | 96 | 38 | 242 | 160 | 47 | 367 | 241 | 62 | 519 | 337 | 73 | 697 | 460 | 86 | 902 | 599 | |
| 10 | 28 | 64 | 44 | 38 | 133 | 89 | 50 | 229 | 150 | 62 | 351 | 228 | 81 | 499 | 321 | 95 | 675 | 443 | 112 | 877 | 576 | |
| 15 | 34 | 58 | 40 | 46 | 124 | 84 | 59 | 217 | 142 | 73 | 337 | 217 | 94 | 481 | 308 | 111 | 654 | 427 | 129 | 853 | 557 | |
| 20 | 48 | 52 | 35 | 55 | 116 | 78 | 69 | 206 | 134 | 84 | 322 | 206 | 107 | 464 | 295 | 125 | 634 | 410 | 145 | 830 | 537 | |
| 30 | 0 | 0 | 100 | 64 | 0 | 213 | 128 | 0 | 374 | 220 | 0 | 587 | 336 | 0 | 853 | 475 | 0 | 1,173 | 650 | 0 | 1,548 | 855 |
| 2 | 9 | 81 | 56 | 13 | 166 | 112 | 14 | 283 | 185 | 18 | 432 | 280 | 27 | 613 | 394 | 33 | 826 | 535 | 42 | 1,072 | 700 | |
| 5 | 21 | 77 | 54 | 28 | 160 | 108 | 36 | 275 | 176 | 45 | 421 | 273 | 58 | 600 | 385 | 69 | 811 | 524 | 82 | 1,055 | 688 | |
| 10 | 27 | 70 | 50 | 37 | 150 | 102 | 48 | 262 | 171 | 59 | 405 | 261 | 77 | 580 | 371 | 91 | 788 | 507 | 107 | 1,028 | 668 | |
| 15 | 33 | 64 | NA | 44 | 141 | 96 | 57 | 249 | 163 | 70 | 389 | 249 | 90 | 560 | 357 | 105 | 765 | 490 | 124 | 1,002 | 648 | |
| 20 | 56 | 58 | NA | 53 | 132 | 90 | 66 | 237 | 154 | 80 | 374 | 237 | 102 | 542 | 343 | 119 | 743 | 473 | 139 | 977 | 628 | |
| 30 | NA | NA | NA | 73 | 113 | NA | 88 | 214 | NA | 104 | 346 | 219 | 131 | 507 | 321 | 149 | 702 | 444 | 171 | 929 | 594 | |
| 50 | 0 | 0 | 101 | 67 | 0 | 216 | 134 | 0 | 397 | 232 | 0 | 633 | 363 | 0 | 932 | 518 | 0 | 1,297 | 708 | 0 | 1,730 | 952 |
| 2 | 8 | 86 | 61 | 11 | 183 | 122 | 14 | 320 | 206 | 15 | 497 | 314 | 22 | 715 | 445 | 26 | 975 | 615 | 33 | 1,276 | 813 | |
| 5 | 20 | 82 | NA | 27 | 177 | 119 | 35 | 312 | 200 | 43 | 487 | 308 | 55 | 702 | 438 | 65 | 960 | 605 | 77 | 1,259 | 798 | |
| 10 | 26 | 76 | NA | 35 | 168 | 114 | 45 | 299 | 190 | 56 | 471 | 298 | 73 | 681 | 426 | 86 | 935 | 589 | 101 | 1,230 | 773 | |
| 15 | 59 | 70 | NA | 42 | 158 | NA | 54 | 287 | 180 | 66 | 455 | 288 | 85 | 662 | 413 | 100 | 911 | 572 | 117 | 1,203 | 747 | |
| 20 | NA | NA | NA | 50 | 149 | NA | 63 | 275 | 169 | 76 | 440 | 278 | 97 | 642 | 401 | 113 | 888 | 556 | 131 | 1,176 | 722 | |
| 30 | NA | NA | NA | 69 | 131 | NA | 84 | 250 | NA | 99 | 410 | 259 | 123 | 605 | 376 | 141 | 844 | 522 | 161 | 1,125 | 670 | |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W.
TABLE G2428.2(2) [504.2(2)]
TYPE B DOUBLE-WALL GAS VENT
| Number of Appliances | Single |
| Appliance Type | Category I |
| Appliance Vent Connection | Single-wall metal connector |
| HEIGHT (H) (feet) | LATERAL (L)(feet) | VENT DIAMETER—(D) inches | ||||||||||||||||||||||||||
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 12 | ||||||||||||||||||||
| APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H | ||||||||||||||||||||||||||||
| FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | |||||||||||
| Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | ||
| 6 | 0 | 38 | 77 | 45 | 59 | 151 | 85 | 85 | 249 | 140 | 126 | 373 | 204 | 165 | 522 | 284 | 211 | 695 | 369 | 267 | 894 | 469 | 371 | 1,118 | 569 | 537 | 1,639 | 849 |
| 2 | 39 | 51 | 36 | 60 | 96 | 66 | 85 | 156 | 104 | 123 | 231 | 156 | 159 | 320 | 213 | 201 | 423 | 284 | 251 | 541 | 368 | 347 | 673 | 453 | 498 | 979 | 648 | |
| 4 | NA | NA | 33 | 74 | 92 | 63 | 102 | 152 | 102 | 146 | 225 | 152 | 187 | 313 | 208 | 237 | 416 | 277 | 295 | 533 | 360 | 409 | 664 | 443 | 584 | 971 | 638 | |
| 6 | NA | NA | 31 | 83 | 89 | 60 | 114 | 147 | 99 | 163 | 220 | 148 | 207 | 307 | 203 | 263 | 409 | 271 | 327 | 526 | 352 | 449 | 656 | 433 | 638 | 962 | 627 | |
| 8 | 0 | 37 | 83 | 50 | 58 | 164 | 93 | 83 | 273 | 154 | 123 | 412 | 234 | 161 | 580 | 319 | 206 | 777 | 414 | 258 | 1,002 | 536 | 360 | 1,257 | 658 | 521 | 1,852 | 967 |
| 2 | 39 | 56 | 39 | 59 | 108 | 75 | 83 | 176 | 119 | 121 | 261 | 179 | 155 | 363 | 246 | 197 | 482 | 321 | 246 | 617 | 417 | 339 | 768 | 513 | 486 | 1,120 | 743 | |
| 5 | NA | NA | 37 | 77 | 102 | 69 | 107 | 168 | 114 | 151 | 252 | 171 | 193 | 352 | 235 | 245 | 470 | 311 | 305 | 604 | 404 | 418 | 754 | 500 | 598 | 1,104 | 730 | |
| 8 | NA | NA | 33 | 90 | 95 | 64 | 122 | 161 | 107 | 175 | 243 | 163 | 223 | 342 | 225 | 280 | 458 | 300 | 344 | 591 | 392 | 470 | 740 | 486 | 665 | 1,089 | 715 | |
| 10 | 0 | 37 | 87 | 53 | 57 | 174 | 99 | 82 | 293 | 165 | 120 | 444 | 254 | 158 | 628 | 344 | 202 | 844 | 449 | 253 | 1,093 | 584 | 351 | 1,373 | 718 | 507 | 2,031 | 1,057 |
| 2 | 39 | 61 | 41 | 59 | 117 | 80 | 82 | 193 | 128 | 119 | 287 | 194 | 153 | 400 | 272 | 193 | 531 | 354 | 242 | 681 | 456 | 332 | 849 | 559 | 475 | 1,242 | 848 | |
| 5 | 52 | 56 | 39 | 76 | 111 | 76 | 105 | 185 | 122 | 148 | 277 | 186 | 190 | 388 | 261 | 241 | 518 | 344 | 299 | 667 | 443 | 409 | 834 | 544 | 584 | 1,224 | 825 | |
| 10 | NA | NA | 34 | 97 | 100 | 68 | 132 | 171 | 112 | 188 | 261 | 171 | 237 | 369 | 241 | 296 | 497 | 325 | 363 | 643 | 423 | 492 | 808 | 520 | 688 | 1,194 | 788 | |
| 15 | 0 | 36 | 93 | 57 | 56 | 190 | 111 | 80 | 325 | 186 | 116 | 499 | 283 | 153 | 713 | 388 | 195 | 966 | 523 | 244 | 1,259 | 681 | 336 | 1,591 | 838 | 488 | 2,374 | 1,237 |
| 2 | 38 | 69 | 47 | 57 | 136 | 93 | 80 | 225 | 149 | 115 | 337 | 224 | 148 | 473 | 314 | 187 | 631 | 413 | 232 | 812 | 543 | 319 | 1,015 | 673 | 457 | 1,491 | 983 | |
| 5 | 51 | 63 | 44 | 75 | 128 | 86 | 102 | 216 | 140 | 144 | 326 | 217 | 182 | 459 | 298 | 231 | 616 | 400 | 287 | 795 | 526 | 392 | 997 | 657 | 562 | 1,469 | 963 | |
| 10 | NA | NA | 39 | 95 | 116 | 79 | 128 | 201 | 131 | 182 | 308 | 203 | 228 | 438 | 284 | 284 | 592 | 381 | 349 | 768 | 501 | 470 | 966 | 628 | 664 | 1,433 | 928 | |
| 15 | NA | NA | NA | NA | NA | 72 | 158 | 186 | 124 | 220 | 290 | 192 | 272 | 418 | 269 | 334 | 568 | 367 | 404 | 742 | 484 | 540 | 937 | 601 | 750 | 1,399 | 894 | |
| 20 | 0 | 35 | 96 | 60 | 54 | 200 | 118 | 78 | 346 | 201 | 114 | 537 | 306 | 149 | 772 | 428 | 190 | 1,053 | 573 | 238 | 1,379 | 750 | 326 | 1,751 | 927 | 473 | 2,631 | 1,346 |
| 2 | 37 | 74 | 50 | 56 | 148 | 99 | 78 | 248 | 165 | 113 | 375 | 248 | 144 | 528 | 344 | 182 | 708 | 468 | 227 | 914 | 611 | 309 | 1,146 | 754 | 443 | 1,689 | 1,098 | |
| 5 | 50 | 68 | 47 | 73 | 140 | 94 | 100 | 239 | 158 | 141 | 363 | 239 | 178 | 514 | 334 | 224 | 692 | 457 | 279 | 896 | 596 | 381 | 1,126 | 734 | 547 | 1,665 | 1,074 | |
| 10 | NA | NA | 41 | 93 | 129 | 86 | 125 | 223 | 146 | 177 | 344 | 224 | 222 | 491 | 316 | 277 | 666 | 437 | 339 | 866 | 570 | 457 | 1,092 | 702 | 646 | 1,626 | 1,037 | |
| 15 | NA | NA | NA | NA | NA | 80 | 155 | 208 | 136 | 216 | 325 | 210 | 264 | 469 | 301 | 325 | 640 | 419 | 393 | 838 | 549 | 526 | 1,060 | 677 | 730 | 1,587 | 1,005 | |
| 20 | NA | NA | NA | NA | NA | NA | 186 | 192 | 126 | 254 | 306 | 196 | 309 | 448 | 285 | 374 | 616 | 400 | 448 | 810 | 526 | 592 | 1,028 | 651 | 808 | 1,550 | 973 | |
| 30 | 0 | 34 | 99 | 63 | 53 | 211 | 127 | 76 | 372 | 219 | 110 | 584 | 334 | 144 | 849 | 472 | 184 | 1,168 | 647 | 229 | 1,542 | 852 | 312 | 1,971 | 1,056 | 454 | 2,996 | 1,545 |
| 2 | 37 | 80 | 56 | 55 | 164 | 111 | 76 | 281 | 183 | 109 | 429 | 279 | 139 | 610 | 392 | 175 | 823 | 533 | 219 | 1,069 | 698 | 296 | 1,346 | 863 | 424 | 1,999 | 1,308 | |
| 5 | 49 | 74 | 52 | 72 | 157 | 106 | 98 | 271 | 173 | 136 | 417 | 271 | 171 | 595 | 382 | 215 | 806 | 521 | 269 | 1,049 | 684 | 366 | 1,324 | 846 | 524 | 1,971 | 1,283 | |
| 10 | NA | NA | NA | 91 | 144 | 98 | 122 | 255 | 168 | 171 | 397 | 257 | 213 | 570 | 367 | 265 | 777 | 501 | 327 | 1,017 | 662 | 440 | 1,287 | 821 | 620 | 1,927 | 1,234 | |
| 15 | NA | NA | NA | 115 | 131 | NA | 151 | 239 | 157 | 208 | 377 | 242 | 255 | 547 | 349 | 312 | 750 | 481 | 379 | 985 | 638 | 507 | 1,251 | 794 | 702 | 1,884 | 1,205 | |
| 20 | NA | NA | NA | NA | NA | NA | 181 | 223 | NA | 246 | 357 | 228 | 298 | 524 | 333 | 360 | 723 | 461 | 433 | 955 | 615 | 570 | 1,216 | 768 | 780 | 1,841 | 1,166 | |
| 30 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | 389 | 477 | 305 | 461 | 670 | 426 | 541 | 895 | 574 | 704 | 1,147 | 720 | 937 | 1,759 | 1,101 | |
| 50 | 0 | 33 | 99 | 66 | 51 | 213 | 133 | 73 | 394 | 230 | 105 | 629 | 361 | 138 | 928 | 515 | 176 | 1,292 | 704 | 220 | 1,724 | 948 | 295 | 2,223 | 1,189 | 428 | 3,432 | 1,818 |
| 2 | 36 | 84 | 61 | 53 | 181 | 121 | 73 | 318 | 205 | 104 | 495 | 312 | 133 | 712 | 443 | 168 | 971 | 613 | 209 | 1,273 | 811 | 280 | 1,615 | 1,007 | 401 | 2,426 | 1,509 | |
| 5 | 48 | 80 | NA | 70 | 174 | 117 | 94 | 308 | 198 | 131 | 482 | 305 | 164 | 696 | 435 | 204 | 953 | 602 | 257 | 1,252 | 795 | 347 | 1,591 | 991 | 496 | 2,396 | 1,490 | |
| 10 | NA | NA | NA | 89 | 160 | NA | 118 | 292 | 186 | 162 | 461 | 292 | 203 | 671 | 420 | 253 | 923 | 583 | 313 | 1,217 | 765 | 418 | 1,551 | 963 | 589 | 2,347 | 1,455 | |
| 15 | NA | NA | NA | 112 | 148 | NA | 145 | 275 | 174 | 199 | 441 | 280 | 244 | 646 | 405 | 299 | 894 | 562 | 363 | 1,183 | 736 | 481 | 1,512 | 934 | 668 | 2,299 | 1,421 | |
| 20 | NA | NA | NA | NA | NA | NA | 176 | 257 | NA | 236 | 420 | 267 | 285 | 622 | 389 | 345 | 866 | 543 | 415 | 1,150 | 708 | 544 | 1,473 | 906 | 741 | 2,251 | 1,387 | |
| 30 | NA | NA | NA | NA | NA | NA | NA | NA | NA | 315 | 376 | NA | 373 | 573 | NA | 442 | 809 | 502 | 521 | 1,086 | 649 | 674 | 1,399 | 848 | 892 | 2,159 | 1,318 | |
For SI:1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W.
These venting tables shall not be used where obstructions, as described in Section G2427.15, are installed in the venting system. The installation of vents serving listed appliances with vent dampers shall be in accordance with the appliance manufacturer's instructions or in accordance with the following:
- The maximum capacity of the vent system shall be determined using the "NAT Max" column.
- The minimum capacity shall be determined as if the appliance were a fan-assisted appliance, using the "FAN Min" column to determine the minimum capacity of the vent system. Where the corresponding "FAN Min" is "NA," the vent configuration shall not be permitted and an alternative venting configuration shall be utilized.
Where the vent size determined from the tables is smaller than the appliance draft hood outlet or flue collar, the smaller size shall be permitted to be used provided that all of the following requirements are met:
- The total vent height (H) is not less than 10 feet (3048 mm).
- Vents for appliance draft hood outlets or flue collars 12 inches (305 mm) in diameter or smaller are not reduced more than one table size.
- Vents for appliance draft hood outlets or flue collars larger than 12 inches (305 mm) in diameter are not reduced more than two table sizes.
- The maximum capacity listed in the tables for a fan-assisted appliance is reduced by 10 percent (0.90 × maximum table capacity).
- The draft hood outlet is greater than 4 inches (102 mm) in diameter. Do not connect a 3-inch-diameter (76 mm) vent to a 4-inch-diameter (102 mm) draft hood outlet. This provision shall not apply to fan-assisted appliances.
Single-appliance venting configurations with zero (0) lateral lengths in Tables G2428.2(1) and G2428.2(2) shall not have elbows in the venting system. Single-appliance venting configurations with lateral lengths include two 90-degree (1.57 rad) elbows. For each additional elbow up to and including 45 degrees (0.79 rad), the maximum capacity listed in the venting tables shall be reduced by 5 percent. For each additional elbow greater than 45 degrees (0.79 rad) up to and including 90 degrees (1.57 rad), the maximum capacity listed in the venting tables shall be reduced by 10 percent. Where multiple offsets occur in a vent, the total lateral length of all offsets combined shall not exceed that specified in Tables G2428.2(1) and G2428.2(2).
Zero (0) lateral (L) shall apply only to a straight vertical vent attached to a top outlet draft hood or flue collar.
Sea-level input ratings shall be used when determining maximum capacity for high-altitude installation. Actual input, derated for altitude, shall be used for determining minimum capacity for high-altitude installation.
Listed corrugated metallic chimney liner systems in masonry chimneys shall be sized by using Table G2428.2(1) or G2428.2(2) for Type B vents with the maximum capacity reduced by 20 percent (0.80 × maximum capacity) and the minimum capacity as shown in Table G2428.2(1) or G2428.2(2). Corrugated metallic liner systems installed with bends or offsets shall have their maximum capacity further reduced in accordance with Section G2428.2.3. The 20-percent reduction for corrugated metallic chimney liner systems includes an allowance for one long-radius 90-degree (1.57 rad) turn at the bottom of the liner.
Connections between chimney liners and listed double-wall connectors shall be made with listed adapters designed for such purpose.
Where the vertical vent has a larger diameter than the vent connector, the vertical vent diameter shall be used to determine the minimum vent capacity, and the connector diameter shall be used to determine the maximum vent capacity. The flow area of the vertical vent shall not exceed seven times the flow area of the listed appliance categorized vent area, flue collar area, or draft hood outlet area unless designed in accordance with approved engineering methods.
Tables G2428.2(1) and G2428.2(2) shall be used only for chimneys and vents not exposed to the outdoors below the roof line. A Type B vent or listed chimney lining system passing through an unused masonry chimney flue shall not be considered to be exposed to the outdoors. Where vents extend outdoors above the roof more than 5 feet (1524 mm) higher than required by Figure G2427.6.4 and where vents terminate in accordance with Section G2427.6.4, Item 2, the outdoor portion of the vent shall be enclosed as required by this section for vents not considered to be exposed to the outdoors or such venting system shall be engineered. A Type B vent shall not be considered to be exposed to the outdoors where it passes through an unventilated enclosure or chase insulated to a value of not less than R-8.
Corrugated vent connectors shall be not smaller than the listed appliance categorized vent diameter, flue collar diameter, or draft hood outlet diameter.
Vent connectors shall not be increased in size more than two sizes greater than the listed appliance categorized vent diameter, flue collar diameter or draft hood outlet diameter.
In a single run of vent or vent connector, different diameters and types of vent and connector components shall be permitted to be used, provided that all such sizes and types are permitted by the tables.
Draft hood conversion accessories for use with masonry chimneys venting listed Category I fan-assisted appliances shall be listed and installed in accordance with the manufacturer's instructions for such listed accessories.
Interpolation shall be permitted in calculating capacities for vent dimensions that fall between the table entries.
Extrapolation beyond the table entries shall not be permitted.
Where the actual height of a vent falls between entries in the height column of the applicable table in Tables G2428.2(1) and G2428.2(2), either interpolation shall be used or the lower appliance input rating shown in the table entries shall be used for FAN Max and NAT Max column values and the higher appliance input rating shall be used for the FAN Min column values.
The application of Tables G2428.3(1) through G2428.3(4) shall be subject to the requirements of Sections G2428.3.1 through G2428.3.24.
TABLE G2428.3(1) [504.3(1)]
TYPE B DOUBLE-WALL VENT
| Number of Appliances | Two or more |
| Appliances Type | Category I |
| Appliances Vent Connection | Type B double-wall connector |
| VENT CONNECTOR CAPACITY | |||||||||||||||||||||||||
| VENT HEIGHT (H) (feet) | CONNECTOR RISE (R) (feet) | TYPE B DOUBLE-WALL VENT AND CONNECTOR DIAMETER—(D) inches | |||||||||||||||||||||||
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | ||||||||||||||||||
| APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H | |||||||||||||||||||||||||
| FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | ||||||||||
| Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | ||
| 6 | 1 | 22 | 37 | 26 | 35 | 66 | 46 | 46 | 106 | 72 | 58 | 164 | 104 | 77 | 225 | 142 | 92 | 296 | 185 | 109 | 376 | 237 | 128 | 466 | 289 |
| 2 | 23 | 41 | 31 | 37 | 75 | 55 | 48 | 121 | 86 | 60 | 183 | 124 | 79 | 253 | 168 | 95 | 333 | 220 | 112 | 424 | 282 | 131 | 526 | 345 | |
| 3 | 24 | 44 | 35 | 38 | 81 | 62 | 49 | 132 | 96 | 62 | 199 | 139 | 82 | 275 | 189 | 97 | 363 | 248 | 114 | 463 | 317 | 134 | 575 | 386 | |
| 8 | 1 | 22 | 40 | 27 | 35 | 72 | 48 | 49 | 114 | 76 | 64 | 176 | 109 | 84 | 243 | 148 | 100 | 320 | 194 | 118 | 408 | 248 | 138 | 507 | 303 |
| 2 | 23 | 44 | 32 | 36 | 80 | 57 | 51 | 128 | 90 | 66 | 195 | 129 | 86 | 269 | 175 | 103 | 356 | 230 | 121 | 454 | 294 | 141 | 564 | 358 | |
| 3 | 24 | 47 | 36 | 37 | 87 | 64 | 53 | 139 | 101 | 67 | 210 | 145 | 88 | 290 | 198 | 105 | 384 | 258 | 123 | 492 | 330 | 143 | 612 | 402 | |
| 10 | 1 | 22 | 43 | 28 | 34 | 78 | 50 | 49 | 123 | 78 | 65 | 189 | 113 | 89 | 257 | 154 | 106 | 341 | 200 | 125 | 436 | 257 | 146 | 542 | 314 |
| 2 | 23 | 47 | 33 | 36 | 86 | 59 | 51 | 136 | 93 | 67 | 206 | 134 | 91 | 282 | 182 | 109 | 374 | 238 | 128 | 479 | 305 | 149 | 596 | 372 | |
| 3 | 24 | 50 | 37 | 37 | 92 | 67 | 52 | 146 | 104 | 69 | 220 | 150 | 94 | 303 | 205 | 111 | 402 | 268 | 131 | 515 | 342 | 152 | 642 | 417 | |
| 15 | 1 | 21 | 50 | 30 | 33 | 89 | 53 | 47 | 142 | 83 | 64 | 220 | 120 | 88 | 298 | 163 | 110 | 389 | 214 | 134 | 493 | 273 | 162 | 609 | 333 |
| 2 | 22 | 53 | 35 | 35 | 96 | 63 | 49 | 153 | 99 | 66 | 235 | 142 | 91 | 320 | 193 | 112 | 419 | 253 | 137 | 532 | 323 | 165 | 658 | 394 | |
| 3 | 24 | 55 | 40 | 36 | 102 | 71 | 51 | 163 | 111 | 68 | 248 | 160 | 93 | 339 | 218 | 115 | 445 | 286 | 140 | 565 | 365 | 167 | 700 | 444 | |
| 20 | 1 | 21 | 54 | 31 | 33 | 99 | 56 | 46 | 157 | 87 | 62 | 246 | 125 | 86 | 334 | 171 | 107 | 436 | 224 | 131 | 552 | 285 | 158 | 681 | 347 |
| 2 | 22 | 57 | 37 | 34 | 105 | 66 | 48 | 167 | 104 | 64 | 259 | 149 | 89 | 354 | 202 | 110 | 463 | 265 | 134 | 587 | 339 | 161 | 725 | 414 | |
| 3 | 23 | 60 | 42 | 35 | 110 | 74 | 50 | 176 | 116 | 66 | 271 | 168 | 91 | 371 | 228 | 113 | 486 | 300 | 137 | 618 | 383 | 164 | 764 | 466 | |
| 30 | 1 | 20 | 62 | 33 | 31 | 113 | 59 | 45 | 181 | 93 | 60 | 288 | 134 | 83 | 391 | 182 | 103 | 512 | 238 | 125 | 649 | 305 | 151 | 802 | 372 |
| 2 | 21 | 64 | 39 | 33 | 118 | 70 | 47 | 190 | 110 | 62 | 299 | 158 | 85 | 408 | 215 | 105 | 535 | 282 | 129 | 679 | 360 | 155 | 840 | 439 | |
| 3 | 22 | 66 | 44 | 34 | 123 | 79 | 48 | 198 | 124 | 64 | 309 | 178 | 88 | 423 | 242 | 108 | 555 | 317 | 132 | 706 | 405 | 158 | 874 | 494 | |
| COMMON VENT CAPACITY | |||||||||||||||||||||
| VENT HEIGHT (H) (feet) | TYPE B DOUBLE-WALL COMMON VENT DIAMETER (D)—inches | ||||||||||||||||||||
| 4 | 5 | 6 | 7 | 8 | 9 | 10 | |||||||||||||||
| COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H | |||||||||||||||||||||
| FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | |
| 6 | 92 | 81 | 65 | 140 | 116 | 103 | 204 | 161 | 147 | 309 | 248 | 200 | 404 | 314 | 260 | 547 | 434 | 335 | 672 | 520 | 410 |
| 8 | 101 | 90 | 73 | 155 | 129 | 114 | 224 | 178 | 163 | 339 | 275 | 223 | 444 | 348 | 290 | 602 | 480 | 378 | 740 | 577 | 465 |
| 10 | 110 | 97 | 79 | 169 | 141 | 124 | 243 | 194 | 178 | 367 | 299 | 242 | 477 | 377 | 315 | 649 | 522 | 405 | 800 | 627 | 495 |
| 15 | 125 | 112 | 91 | 195 | 164 | 144 | 283 | 228 | 206 | 427 | 352 | 280 | 556 | 444 | 365 | 753 | 612 | 465 | 924 | 733 | 565 |
| 20 | 136 | 123 | 102 | 215 | 183 | 160 | 314 | 255 | 229 | 475 | 394 | 310 | 621 | 499 | 405 | 842 | 688 | 523 | 1,035 | 826 | 640 |
| 30 | 152 | 138 | 118 | 244 | 210 | 185 | 361 | 297 | 266 | 547 | 459 | 360 | 720 | 585 | 470 | 979 | 808 | 605 | 1,209 | 975 | 740 |
| 50 | 167 | 153 | 134 | 279 | 244 | 214 | 421 | 353 | 310 | 641 | 547 | 423 | 854 | 706 | 550 | 1,164 | 977 | 705 | 1,451 | 1,188 | 860 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W.
TABLE G2428.3(2) [504.3(2)]
TYPE B DOUBLE-WALL VENT
| Number of Appliances | Two or more |
| Appliances Type | Category I |
| Appliances Vent Connection | Single-wall metal connector |
| VENT CONNECTOR CAPACITY | |||||||||||||||||||||||||
| VENT HEIGHT (H) (feet) | CONNECTOR RISE (R) (feet) | SINGLE-WALL METAL VENT CONNECTOR DIAMETER—(D) inches | |||||||||||||||||||||||
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | ||||||||||||||||||
| APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H | |||||||||||||||||||||||||
| FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | ||||||||||
| Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | ||
| 6 | 1 | NA | NA | 26 | NA | NA | 46 | NA | NA | 71 | NA | NA | 102 | 207 | 223 | 140 | 262 | 293 | 183 | 325 | 373 | 234 | 447 | 463 | 286 |
| 2 | NA | NA | 31 | NA | NA | 55 | NA | NA | 85 | 168 | 182 | 123 | 215 | 251 | 167 | 271 | 331 | 219 | 334 | 422 | 281 | 458 | 524 | 344 | |
| 3 | NA | NA | 34 | NA | NA | 62 | 121 | 131 | 95 | 175 | 198 | 138 | 222 | 273 | 188 | 279 | 361 | 247 | 344 | 462 | 316 | 468 | 574 | 385 | |
| 8 | 1 | NA | NA | 27 | NA | NA | 48 | NA | NA | 75 | NA | NA | 106 | 226 | 240 | 145 | 285 | 316 | 191 | 352 | 403 | 244 | 481 | 502 | 299 |
| 2 | NA | NA | 32 | NA | NA | 57 | 125 | 126 | 89 | 184 | 193 | 127 | 234 | 266 | 173 | 293 | 353 | 228 | 360 | 450 | 292 | 492 | 560 | 355 | |
| 3 | NA | NA | 35 | NA | NA | 64 | 130 | 138 | 100 | 191 | 208 | 144 | 241 | 287 | 197 | 302 | 381 | 256 | 370 | 489 | 328 | 501 | 609 | 400 | |
| 10 | 1 | NA | NA | 28 | NA | NA | 50 | 119 | 121 | 77 | 182 | 186 | 110 | 240 | 253 | 150 | 302 | 335 | 196 | 372 | 429 | 252 | 506 | 534 | 308 |
| 2 | NA | NA | 33 | 84 | 85 | 59 | 124 | 134 | 91 | 189 | 203 | 132 | 248 | 278 | 183 | 311 | 369 | 235 | 381 | 473 | 302 | 517 | 589 | 368 | |
| 3 | NA | NA | 36 | 89 | 91 | 67 | 129 | 144 | 102 | 197 | 217 | 148 | 257 | 299 | 203 | 320 | 398 | 265 | 391 | 511 | 339 | 528 | 637 | 413 | |
| 15 | 1 | NA | NA | 29 | 79 | 87 | 52 | 116 | 138 | 81 | 177 | 214 | 116 | 238 | 291 | 158 | 312 | 380 | 208 | 397 | 482 | 266 | 556 | 596 | 324 |
| 2 | NA | NA | 34 | 83 | 94 | 62 | 121 | 150 | 97 | 185 | 230 | 138 | 246 | 314 | 189 | 321 | 411 | 248 | 407 | 522 | 317 | 568 | 646 | 387 | |
| 3 | NA | NA | 39 | 87 | 100 | 70 | 127 | 160 | 109 | 193 | 243 | 157 | 255 | 333 | 215 | 331 | 438 | 281 | 418 | 557 | 360 | 579 | 690 | 437 | |
| 20 | 1 | 49 | 56 | 30 | 78 | 97 | 54 | 115 | 152 | 84 | 175 | 238 | 120 | 233 | 325 | 165 | 306 | 425 | 217 | 390 | 538 | 276 | 546 | 664 | 336 |
| 2 | 52 | 59 | 36 | 82 | 103 | 64 | 120 | 163 | 101 | 182 | 252 | 144 | 243 | 346 | 197 | 317 | 453 | 259 | 400 | 574 | 331 | 558 | 709 | 403 | |
| 3 | 55 | 62 | 40 | 87 | 107 | 72 | 125 | 172 | 113 | 190 | 264 | 164 | 252 | 363 | 223 | 326 | 476 | 294 | 412 | 607 | 375 | 570 | 750 | 457 | |
| 30 | 1 | 47 | 60 | 31 | 77 | 110 | 57 | 112 | 175 | 89 | 169 | 278 | 129 | 226 | 380 | 175 | 296 | 497 | 230 | 378 | 630 | 294 | 528 | 779 | 358 |
| 2 | 51 | 62 | 37 | 81 | 115 | 67 | 117 | 185 | 106 | 177 | 290 | 152 | 236 | 397 | 208 | 307 | 521 | 274 | 389 | 662 | 349 | 541 | 819 | 425 | |
| 3 | 54 | 64 | 42 | 85 | 119 | 76 | 122 | 193 | 120 | 185 | 300 | 172 | 244 | 412 | 235 | 316 | 542 | 309 | 400 | 690 | 394 | 555 | 855 | 482 | |
| COMMON VENT CAPACITY | |||||||||||||||||||||
| VENT HEIGHT (H) (feet) | TYPE B DOUBLE-WALL COMMON VENT DIAMETER—(D) inches | ||||||||||||||||||||
| 4 | 5 | 6 | 7 | 8 | 9 | 10 | |||||||||||||||
| COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H | |||||||||||||||||||||
| FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | |
| 6 | NA | 78 | 64 | NA | 113 | 99 | 200 | 158 | 144 | 304 | 244 | 196 | 398 | 310 | 257 | 541 | 429 | 332 | 665 | 515 | 407 |
| 8 | NA | 87 | 71 | NA | 126 | 111 | 218 | 173 | 159 | 331 | 269 | 218 | 436 | 342 | 285 | 592 | 473 | 373 | 730 | 569 | 460 |
| 10 | NA | 94 | 76 | 163 | 137 | 120 | 237 | 189 | 174 | 357 | 292 | 236 | 467 | 369 | 309 | 638 | 512 | 398 | 787 | 617 | 487 |
| 15 | 121 | 108 | 88 | 189 | 159 | 140 | 275 | 221 | 200 | 416 | 343 | 274 | 544 | 434 | 357 | 738 | 599 | 456 | 905 | 718 | 553 |
| 20 | 131 | 118 | 98 | 208 | 177 | 156 | 305 | 247 | 223 | 463 | 383 | 302 | 606 | 487 | 395 | 824 | 673 | 512 | 1,013 | 808 | 626 |
| 30 | 145 | 132 | 113 | 236 | 202 | 180 | 350 | 286 | 257 | 533 | 446 | 349 | 703 | 570 | 459 | 958 | 790 | 593 | 1,183 | 952 | 723 |
| 50 | 159 | 145 | 128 | 268 | 233 | 208 | 406 | 337 | 296 | 622 | 529 | 410 | 833 | 686 | 535 | 1,139 | 954 | 689 | 1,418 | 1,157 | 838 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W.
TABLE G2428.3(3) [504.3(3)]
| Number of Appliances | Two or more |
| Appliances Type | Category I |
| Appliances Vent Connection | Type B double-wall connector |
| VENT CONNECTOR CAPACITY | |||||||||||||||||||||||||
| VENT HEIGHT (H) (feet) | CONNECTOR RISE (R) (feet) | TYPE B DOUBLE-WALL VENT CONNECTOR DIAMETER—(D) inches | |||||||||||||||||||||||
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | ||||||||||||||||||
| APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H | |||||||||||||||||||||||||
| FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | ||||||||||
| Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | ||
| 6 | 1 | 24 | 33 | 21 | 39 | 62 | 40 | 52 | 106 | 67 | 65 | 194 | 101 | 87 | 274 | 141 | 104 | 370 | 201 | 124 | 479 | 253 | 145 | 599 | 319 |
| 2 | 26 | 43 | 28 | 41 | 79 | 52 | 53 | 133 | 85 | 67 | 230 | 124 | 89 | 324 | 173 | 107 | 436 | 232 | 127 | 562 | 300 | 148 | 694 | 378 | |
| 3 | 27 | 49 | 34 | 42 | 92 | 61 | 55 | 155 | 97 | 69 | 262 | 143 | 91 | 369 | 203 | 109 | 491 | 270 | 129 | 633 | 349 | 151 | 795 | 439 | |
| 8 | 1 | 24 | 39 | 22 | 39 | 72 | 41 | 55 | 117 | 69 | 71 | 213 | 105 | 94 | 304 | 148 | 113 | 414 | 210 | 134 | 539 | 267 | 156 | 682 | 335 |
| 2 | 26 | 47 | 29 | 40 | 87 | 53 | 57 | 140 | 86 | 73 | 246 | 127 | 97 | 350 | 179 | 116 | 473 | 240 | 137 | 615 | 311 | 160 | 776 | 394 | |
| 3 | 27 | 52 | 34 | 42 | 97 | 62 | 59 | 159 | 98 | 75 | 269 | 145 | 99 | 383 | 206 | 119 | 517 | 276 | 139 | 672 | 358 | 163 | 848 | 452 | |
| 10 | 1 | 24 | 42 | 22 | 38 | 80 | 42 | 55 | 130 | 71 | 74 | 232 | 108 | 101 | 324 | 153 | 120 | 444 | 216 | 142 | 582 | 277 | 165 | 739 | 348 |
| 2 | 26 | 50 | 29 | 40 | 93 | 54 | 57 | 153 | 87 | 76 | 261 | 129 | 103 | 366 | 184 | 123 | 498 | 247 | 145 | 652 | 321 | 168 | 825 | 407 | |
| 3 | 27 | 55 | 35 | 41 | 105 | 63 | 58 | 170 | 100 | 78 | 284 | 148 | 106 | 397 | 209 | 126 | 540 | 281 | 147 | 705 | 366 | 171 | 893 | 463 | |
| 15 | 1 | 24 | 48 | 23 | 38 | 93 | 44 | 54 | 154 | 74 | 72 | 277 | 114 | 100 | 384 | 164 | 125 | 511 | 229 | 153 | 658 | 297 | 184 | 824 | 375 |
| 2 | 25 | 55 | 31 | 39 | 105 | 55 | 56 | 174 | 89 | 74 | 299 | 134 | 103 | 419 | 192 | 128 | 558 | 260 | 156 | 718 | 339 | 187 | 900 | 432 | |
| 3 | 26 | 59 | 35 | 41 | 115 | 64 | 57 | 189 | 102 | 76 | 319 | 153 | 105 | 448 | 215 | 131 | 597 | 292 | 159 | 760 | 382 | 190 | 960 | 486 | |
| 20 | 1 | 24 | 52 | 24 | 37 | 102 | 46 | 53 | 172 | 77 | 71 | 313 | 119 | 98 | 437 | 173 | 123 | 584 | 239 | 150 | 752 | 312 | 180 | 943 | 397 |
| 2 | 25 | 58 | 31 | 39 | 114 | 56 | 55 | 190 | 91 | 73 | 335 | 138 | 101 | 467 | 199 | 126 | 625 | 270 | 153 | 805 | 354 | 184 | 1,011 | 452 | |
| 3 | 26 | 63 | 35 | 40 | 123 | 65 | 57 | 204 | 104 | 75 | 353 | 157 | 104 | 493 | 222 | 129 | 661 | 301 | 156 | 851 | 396 | 187 | 1,067 | 505 | |
| COMMON VENT CAPACITY | ||||||||||||||||||||||||
| VENT HEIGHT (H) (feet) | MINIMUM INTERNAL AREA OF MASONRY CHIMNEY FLUE (square inches) | |||||||||||||||||||||||
| 12 | 19 | 28 | 38 | 50 | 63 | 78 | 113 | |||||||||||||||||
| COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H | ||||||||||||||||||||||||
| FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | |
| 6 | NA | 74 | 25 | NA | 119 | 46 | NA | 178 | 71 | NA | 257 | 103 | NA | 351 | 143 | NA | 458 | 188 | NA | 582 | 246 | 1,041 | 853 | NA |
| 8 | NA | 80 | 28 | NA | 130 | 53 | NA | 193 | 82 | NA | 279 | 119 | NA | 384 | 163 | NA | 501 | 218 | 724 | 636 | 278 | 1,144 | 937 | 408 |
| 10 | NA | 84 | 31 | NA | 138 | 56 | NA | 207 | 90 | NA | 299 | 131 | NA | 409 | 177 | 606 | 538 | 236 | 776 | 686 | 302 | 1,226 | 1,010 | 454 |
| 15 | NA | NA | 36 | NA | 152 | 67 | NA | 233 | 106 | NA | 334 | 152 | 523 | 467 | 212 | 682 | 611 | 283 | 874 | 781 | 365 | 1,374 | 1,156 | 546 |
| 20 | NA | NA | 41 | NA | NA | 75 | NA | 250 | 122 | NA | 368 | 172 | 565 | 508 | 243 | 742 | 668 | 325 | 955 | 858 | 419 | 1,513 | 1,286 | 648 |
| 30 | NA | NA | NA | NA | NA | NA | NA | 270 | 137 | NA | 404 | 198 | 615 | 564 | 278 | 816 | 747 | 381 | 1,062 | 969 | 496 | 1,702 | 1,473 | 749 |
| 50 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | 620 | 328 | 879 | 831 | 461 | 1,165 | 1,089 | 606 | 1,905 | 1,692 | 922 |
For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm2, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W.
TABLE G2428.3(4) [504.3(4)]
| Number of Appliances | Two or more |
| Appliances Type | Category I |
| Appliances Vent Connection | Single-wall connector |
| VENT CONNECTOR CAPACITY | |||||||||||||||||||||||||
| VENT HEIGHT (H) (feet) | CONNECTOR RISE (R) (feet) | SINGLE-WALL METAL VENT CONNECTOR DIAMETER (D)—inches | |||||||||||||||||||||||
| 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | ||||||||||||||||||
| APPLIANCE INPUT RATING LIMITS IN THOUSANDS OF BTU/H | |||||||||||||||||||||||||
| FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | FAN | NAT | ||||||||||
| Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | Min | Max | Max | ||
| 6 | 1 | NA | NA | 21 | NA | NA | 39 | NA | NA | 66 | 179 | 191 | 100 | 231 | 271 | 140 | 292 | 366 | 200 | 362 | 474 | 252 | 499 | 594 | 316 |
| 2 | NA | NA | 28 | NA | NA | 52 | NA | NA | 84 | 186 | 227 | 123 | 239 | 321 | 172 | 301 | 432 | 231 | 373 | 557 | 299 | 509 | 696 | 376 | |
| 3 | NA | NA | 34 | NA | NA | 61 | 134 | 153 | 97 | 193 | 258 | 142 | 247 | 365 | 202 | 309 | 491 | 269 | 381 | 634 | 348 | 519 | 793 | 437 | |
| 8 | 1 | NA | NA | 21 | NA | NA | 40 | NA | NA | 68 | 195 | 208 | 103 | 250 | 298 | 146 | 313 | 407 | 207 | 387 | 530 | 263 | 529 | 672 | 331 |
| 2 | NA | NA | 28 | NA | NA | 52 | 137 | 139 | 85 | 202 | 240 | 125 | 258 | 343 | 177 | 323 | 465 | 238 | 397 | 607 | 309 | 540 | 766 | 391 | |
| 3 | NA | NA | 34 | NA | NA | 62 | 143 | 156 | 98 | 210 | 264 | 145 | 266 | 376 | 205 | 332 | 509 | 274 | 407 | 663 | 356 | 551 | 838 | 450 | |
| 10 | 1 | NA | NA | 22 | NA | NA | 41 | 130 | 151 | 70 | 202 | 225 | 106 | 267 | 316 | 151 | 333 | 434 | 213 | 410 | 571 | 273 | 558 | 727 | 343 |
| 2 | NA | NA | 29 | NA | NA | 53 | 136 | 150 | 86 | 210 | 255 | 128 | 276 | 358 | 181 | 343 | 489 | 244 | 420 | 640 | 317 | 569 | 813 | 403 | |
| 3 | NA | NA | 34 | 97 | 102 | 62 | 143 | 166 | 99 | 217 | 277 | 147 | 284 | 389 | 207 | 352 | 530 | 279 | 430 | 694 | 363 | 580 | 880 | 459 | |
| 15 | 1 | NA | NA | 23 | NA | NA | 43 | 129 | 151 | 73 | 199 | 271 | 112 | 268 | 376 | 161 | 349 | 502 | 225 | 445 | 646 | 291 | 623 | 808 | 366 |
| 2 | NA | NA | 30 | 92 | 103 | 54 | 135 | 170 | 88 | 207 | 295 | 132 | 277 | 411 | 189 | 359 | 548 | 256 | 456 | 706 | 334 | 634 | 884 | 424 | |
| 3 | NA | NA | 34 | 96 | 112 | 63 | 141 | 185 | 101 | 215 | 315 | 151 | 286 | 439 | 213 | 368 | 586 | 289 | 466 | 755 | 378 | 646 | 945 | 479 | |
| 20 | 1 | NA | NA | 23 | 87 | 99 | 45 | 128 | 167 | 76 | 197 | 303 | 117 | 265 | 425 | 169 | 345 | 569 | 235 | 439 | 734 | 306 | 614 | 921 | 347 |
| 2 | NA | NA | 30 | 91 | 111 | 55 | 134 | 185 | 90 | 205 | 325 | 136 | 274 | 455 | 195 | 355 | 610 | 266 | 450 | 787 | 348 | 627 | 986 | 443 | |
| 3 | NA | NA | 35 | 96 | 119 | 64 | 140 | 199 | 103 | 213 | 343 | 154 | 282 | 481 | 219 | 365 | 644 | 298 | 461 | 831 | 391 | 639 | 1,042 | 496 | |
| COMMON VENT CAPACITY | ||||||||||||||||||||||||
| VENT HEIGHT (H) (feet) | MINIMUM INTERNAL AREA OF MASONRY CHIMNEY FLUE (square inches) | |||||||||||||||||||||||
| 12 | 19 | 28 | 38 | 50 | 63 | 78 | 113 | |||||||||||||||||
| COMBINED APPLIANCE INPUT RATING IN THOUSANDS OF BTU/H | ||||||||||||||||||||||||
| FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | FAN +FAN | FAN +NAT | NAT +NAT | |
| 6 | NA | NA | 25 | NA | 118 | 45 | NA | 176 | 71 | NA | 255 | 102 | NA | 348 | 142 | NA | 455 | 187 | NA | 579 | 245 | NA | 846 | NA |
| 8 | NA | NA | 28 | NA | 128 | 52 | NA | 190 | 81 | NA | 276 | 118 | NA | 380 | 162 | NA | 497 | 217 | NA | 633 | 277 | 1,136 | 928 | 405 |
| 10 | NA | NA | 31 | NA | 136 | 56 | NA | 205 | 89 | NA | 295 | 129 | NA | 405 | 175 | NA | 532 | 234 | 171 | 680 | 300 | 1,216 | 1,000 | 450 |
| 15 | NA | NA | 36 | NA | NA | 66 | NA | 230 | 105 | NA | 335 | 150 | NA | 400 | 210 | 677 | 602 | 280 | 866 | 772 | 360 | 1,359 | 1,139 | 540 |
| 20 | NA | NA | NA | NA | NA | 74 | NA | 247 | 120 | NA | 362 | 170 | NA | 503 | 240 | 765 | 661 | 321 | 947 | 849 | 415 | 1,495 | 1,264 | 640 |
| 30 | NA | NA | NA | NA | NA | NA | NA | NA | 135 | NA | 398 | 195 | NA | 558 | 275 | 808 | 739 | 377 | 1,052 | 957 | 490 | 1,682 | 1,447 | 740 |
| 50 | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | NA | 612 | 325 | NA | 821 | 456 | 1,152 | 1,076 | 600 | 1,879 | 1,672 | 910 |
For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm2, 1 foot = 304.8 mm, 1 British thermal unit per hour = 0.2931 W.
These venting tables shall not be used where obstructions, as described in Section G2427.15, are installed in the venting system. The installation of vents serving listed appliances with vent dampers shall be in accordance with the appliance manufacturer's instructions or in accordance with the following:
- The maximum capacity of the vent connector shall be determined using the NAT Max column.
- The maximum capacity of the vertical vent or chimney shall be determined using the FAN + NAT column where the second appliance is a fan-assisted appliance, or the NAT + NAT column where the second appliance is equipped with a draft hood.
- The minimum capacity shall be determined as if the appliance were a fan-assisted appliance.
- The minimum capacity of the vent connector shall be determined using the FAN Min column.
- The FAN + FAN column shall be used where the second appliance is a fan-assisted appliance, and the FAN + NAT column shall be used where the second appliance is equipped with a draft hood, to determine whether the vertical vent or chimney configuration is not permitted (NA). Where the vent configuration is NA, the vent configuration shall not be permitted and an alternative venting configuration shall be utilized.
The vent connector shall be routed to the vent utilizing the shortest possible route. Except as provided in Section G2428.3.3, the maximum vent connector horizontal length shall be 11/2 feet for each inch (18 mm per mm) of connector diameter as shown in Table G2428.3.2.
TABLE G2428.3.2 (504.3.2)
MAXIMUM VENT CONNECTOR LENGTH
| CONNECTOR DIAMETER (inches) | CONNECTOR MAXIMUM HORIZONTAL LENGTH (feet) |
| 3 | 41/2 |
| 4 | 6 |
| 5 | 71/2 |
| 6 | 9 |
| 7 | 101/2 |
| 8 | 12 |
| 9 | 131/2 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
Connectors with longer horizontal lengths than those listed in Section G2428.3.2 are permitted under the following conditions:
- The maximum capacity (FAN Max or NAT Max) of the vent connector shall be reduced 10 percent for each additional multiple of the length allowed by Section G2428.3.2. For example, the maximum length listed in Table G2428.3.2 for a 4-inch (102 mm) connector is 6 feet (1829 mm). With a connector length greater than 6 feet (1829 mm) but not exceeding 12 feet (3658 mm), the maximum capacity must be reduced by 10 percent (0.90 × maximum vent connector capacity). With a connector length greater than 12 feet (3658 mm), but not exceeding 18 feet (5486 mm), the maximum capacity must be reduced by 20 percent (0.80 × maximum vent capacity).
- For a connector serving a fan-assisted appliance, the minimum capacity (FAN Min) of the connector shall be determined by referring to the corresponding single-appliance table. For Type B double-wall connectors, Table G2428.2(1) shall be used. For single-wall connectors, Table G2428.2(2) shall be used. The height (H) and lateral (L) shall be measured according to the procedures for a single-appliance vent, as if the other appliances were not present.
Where the vent connectors are combined prior to entering the vertical portion of the common vent to form a common vent manifold, the size of the common vent manifold and the common vent shall be determined by applying a 10-percent reduction (0.90 × maximum common vent capacity) to the common vent capacity part of the common vent tables. The length of the common vent connector manifold (Lm) shall not exceed 11/2 feet for each inch (18 mm per mm) of common vent connector manifold diameter (D).
Where the common vertical vent is offset, the maximum capacity of the common vent shall be reduced in accordance with Section G2428.3.6. The horizontal length of the common vent offset (Lo) shall not exceed 11/2 feet for each inch (18 mm per mm) of common vent diameter (D). Where multiple offsets occur in a common vent, the total horizontal length of all offsets combined shall not exceed 11/2 feet for each inch (18 mm per mm) of the common vent diameter (D).
For each elbow up to and including 45 degrees (0.79 rad) in the common vent, the maximum common vent capacity listed in the venting tables shall be reduced by 5 percent. For each elbow greater than 45 degrees (0.79 rad) up to and including 90 degrees (1.57 rad), the maximum common vent capacity listed in the venting tables shall be reduced by 10 percent.
The vent connector capacities listed in the common vent sizing tables include allowance for two 90-degree (1.57 rad) elbows. For each additional elbow up to and including 45 degrees (0.79 rad), the maximum vent connector capacity listed in the venting tables shall be reduced by 5 percent. For each elbow greater than 45 degrees (0.79 rad) up to and including 90 degrees (1.57 rad), the maximum vent connector capacity listed in the venting tables shall be reduced by 10 percent.
The cross-sectional area of the common vent shall be equal to or greater than the cross-sectional area of the largest connector.
At the point where tee or wye fittings connect to a common vent, the opening size of the fitting shall be equal to the size of the common vent. Such fittings shall not be prohibited from having reduced-size openings at the point of connection of appliance vent connectors.
Sea-level input ratings shall be used when determining maximum capacity for high-altitude installation. Actual input, derated for altitude, shall be used for determining minimum capacity for high-altitude installation.
Connector rise (R) for each appliance connector shall be measured from the draft hood outlet or flue collar to the centerline where the vent gas streams come together.
For multiple appliances all located on one floor, available total height (H) shall be measured from the highest draft hood outlet or flue collar up to the level of the outlet of the common vent.
Where two or more appliances are connected to a vertical vent or chimney, the flow area of the largest section of vertical vent or chimney shall not exceed seven times the smallest listed appliance categorized vent areas, flue collar area, or draft hood outlet area unless designed in accordance with approved engineering methods.
The minimum vent connector capacity (FAN Min) for appliances with more than one input rate shall be determined from the tables and shall be less than the lowest appliance input rating. The maximum vent connector capacity (FAN Max or NAT Max) for appliances with more than one input rate shall be determined from the tables and shall be greater than the highest appliance input rating.
Listed, corrugated metallic chimney liner systems in masonry chimneys shall be sized by using Table G2428.3(1) or G2428.3(1) for Type B vents, with the maximum capacity reduced by 20 percent (0.80 × maximum capacity) and the minimum capacity as shown in Table G2428.3(1) or G2428.3(1). Corrugated metallic liner systems installed with bends or offsets shall have their maximum capacity further reduced in accordance with Sections G2428.3.5 and G2428.3.6. The 20-percent reduction for corrugated metallic chimney liner systems includes an allowance for one long-radius 90-degree (1.57 rad) turn at the bottom of the liner. Where double-wall connectors are required, tee and wye fittings used to connect to the common vent chimney liner shall be listed double-wall fittings. Connections between chimney liners and listed double-wall fittings shall be made with listed adapter fittings designed for such purpose.
Tables G2428.3(1), G2428.3(2), G2428.3(3) and G2428.3(4) shall be used only for chimneys and vents not exposed to the outdoors below the roof line. A Type B vent or listed chimney lining system passing through an unused masonry chimney flue shall not be considered to be exposed to the outdoors. Where vents extend outdoors above the roof more than 5 feet (1524 mm) higher than required by Figure G2427.6.4 and where vents terminate in accordance with Section G2427.6.4, Item 2, the outdoor portion of the vent shall be enclosed as required by this section for vents not considered to be exposed to the outdoors or such venting system shall be engineered. A Type B vent shall not be considered to be exposed to the outdoors where it passes through an unventilated enclosure or chase insulated to a value of not less than R-8.
Vent connectors shall not be increased in size more than two sizes greater than the listed appliance categorized vent diameter, flue collar diameter or draft hood outlet diameter. Vent connectors for draft hood-equipped appliances shall not be smaller than the draft hood outlet diameter. Where a vent connector size(s) determined from the tables for a fan-assisted appliance(s) is smaller than the flue collar diameter, the use of the smaller size(s) shall be permitted provided that the installation complies with all of the following conditions:
- Vent connectors for fan-assisted appliance flue collars 12 inches (305 mm) in diameter or smaller are not reduced by more than one table size [for example, 12 inches to 10 inches (305 mm to 254 mm) is a one-size reduction] and those larger than 12 inches (305 mm) in diameter are not reduced more than two table sizes [for example, 24 inches to 20 inches (610 mm to 508 mm) is a two-size reduction].
- The fan-assisted appliance(s) is common vented with a draft hood-equipped appliance(s).
- The vent connector has a smooth interior wall.
Combinations of pipe sizes and combinations of single-wall and double-wall metal pipe shall be allowed within any connector run(s) or within the common vent, provided that all of the appropriate tables permit all of the desired sizes and types of pipe, as if they were used for the entire length of the subject connector or vent. Where single-wall and Type B double-wall metal pipes are used for vent connectors within the same venting system, the common vent must be sized using Table G2428.3(2) or G2428.3(4), as appropriate.
Draft hood conversion accessories for use with masonry chimneys venting listed Category I fan-assisted appliances shall be listed and installed in accordance with the manufacturer's instructions for such listed accessories.
Interpolation shall be permitted in calculating capacities for vent dimensions that fall between table entries.
Extrapolation beyond the table entries shall not be permitted.
Where the actual height of a vent falls between entries in the height column of the applicable table in Tables G2428.3(1) through G2428.3(4), either interpolation shall be used or the lower appliance input rating shown in the table shall be used for FAN Max and NAT Max column values and the higher appliance input rating shall be used for the FAN Min column values.
The installation of direct-vent and integral vent appliances shall be in accordance with Section G2427. Mechanical venting systems shall be designed and installed in accordance with Section G2427.
Factory-built chimneys for building heating appliances producing flue gases having a temperature not greater than 1,000°F (538°C), measured at the entrance to the chimney, shall be listed and labeled in accordance with UL 103 and shall be installed and terminated in accordance with the manufacturer's instructions.
Where factory-built chimneys are supported by structural members, such as joists and rafters, such members shall be designed to support the additional load.
Sections G2432 through G2453 shall govern the approval, design, installation, construction, maintenance, alteration and repair of the appliances and equipment specifically identified herein.
UpCodes Diagram (1)
Decorative appliances for installation in approved solid fuel-burning fireplaces shall be listed in accordance with ANSI Z21.60/CSA 6.26 and shall be installed in accordance with the manufacturer's instructions. Manually lighted natural gas decorative appliances shall be listed in accordance with ANSI Z21.84.
Decorative appliances for installation in approved solid fuel-burning fireplaces, with the exception of those listed in accordance with ANSI Z21.84, shall utilize a direct ignition device, an ignitor or a pilot flame to ignite the fuel at the main burner, and shall be equipped with a flame safeguard device. The flame safeguard device shall automatically shut off the fuel supply to a main burner or group of burners when the means of ignition of such burners becomes inoperative.
Decorative appliances for installation in fireplaces shall not be installed where prohibited by Section G2406.2.
Log lighters shall be listed in accordance with CSA 8 and shall be installed in accordance with the manufacturer's instructions.
UpCodes Diagram (1)
Vented gas fireplaces shall be listed in accordance with ANSI Z21.50/CSA 2.22, shall be installed in accordance with the manufacturer's instructions and shall be designed and equipped as specified in Section G2432.2.
Panels, grilles and access doors that are required to be removed for normal servicing operations shall not be attached to the building.
UpCodes Diagram (1)
Vented gas fireplace heaters shall be installed in accordance with the manufacturer's instructions, shall be listed in accordance with Z21.88/CSA 2.33 and shall be designed and equipped as specified in Section G2432.2.
Vented wall furnaces shall be listed in accordance with ANSI Z21.86/CSA 2.32 and shall be installed in accordance with the manufacturer's instructions.
Vented wall furnaces shall be vented in accordance with Section G2427.
Vented wall furnaces shall be located so as not to cause a fire hazard to walls, floors, combustible furnishings or doors. Vented wall furnaces installed between bathrooms and adjoining rooms shall not circulate air from bathrooms to other parts of the building.
Vented wall furnaces shall be provided with access for cleaning of heating surfaces, removal of burners, replacement of sections, motors, controls, filters and other working parts, and for adjustments and lubrication of parts requiring such attention. Panels, grilles and access doors that are required to be removed for normal servicing operations shall not be attached to the building construction.
UpCodes Diagram (1)
Floor furnaces shall be listed in accordance with ANSI Z21.86/CSA 2.32 and shall be installed in accordance with the manufacturer's instructions.
The following provisions apply to floor furnaces:
- Floors. Floor furnaces shall not be installed in the floor of any doorway, stairway landing, aisle or passageway of any enclosure, public or private, or in an exitway from any such room or space.
- Walls and corners. The register of a floor furnace with a horizontal warm air outlet shall not be placed closer than 6 inches (152 mm) to the nearest wall. A distance of not less than 18 inches (457 mm) from two adjoining sides of the floor furnace register to walls shall be provided to eliminate the necessity of occupants walking over the warm-air discharge. The remaining sides shall be permitted to be placed not closer than 6 inches (152 mm) to a wall. Wall-register models shall not be placed closer than 6 inches (152 mm) to a corner.
- Draperies. The furnace shall be placed so that a door, drapery, or similar object cannot be nearer than 12 inches (305 mm) to any portion of the register of the furnace.
- Floor construction. Floor furnaces shall not be installed in concrete floor construction built on grade.
- Thermostat. The controlling thermostat for a floor furnace shall be located within the same room or space as the floor furnace or shall be located in an adjacent room or space that is permanently open to the room or space containing the floor furnace.
The lowest portion of the floor furnace shall have not less than a 6-inch (152 mm) clearance from the grade level; except where the lower 6-inch (152 mm) portion of the floor furnace is sealed by the manufacturer to prevent entrance of water, the minimum clearance shall be not less than 2 inches (51 mm). Where such clearances cannot be provided, the ground below and to the sides shall be excavated to form a pit under the furnace so that the required clearance is provided beneath the lowest portion of the furnace. A 12-inch (305 mm) minimum clearance shall be provided on all sides except the control side, which shall have an 18-inch (457 mm) minimum clearance.
Where the basement story level below the floor in which a floor furnace is installed is utilized as habitable space, such floor furnaces shall be enclosed as specified in Section G2437.6 and shall project into a nonhabitable space.
Floor furnaces installed in upper stories of buildings shall project below into nonhabitable space and shall be separated from the nonhabitable space by an enclosure constructed of noncombustible materials. The floor furnace shall be provided with access, clearance to all sides and bottom of not less than 6 inches (152 mm) and combustion air in accordance with Section G2407.
Clothes dryers shall be listed in accordance with ANSI Z21.5.1/CSA 7.1 and shall be installed in accordance with the manufacturer's instructions.
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Assembly (1)
Clothes dryers shall be exhausted in accordance with the manufacturer's instructions. Dryer exhaust systems shall be independent of all other systems and shall convey the moisture and any products of combustion to the outside of the building.
Ducts that exhaust clothes dryers shall not penetrate or be located within any fireblocking, draftstopping or any wall, floor/ceiling or other assembly required by this code to be fire-resistance rated, unless such duct is constructed of galvanized steel or aluminum of the thickness specified in the mechanical provisions of this code and the fire-resistance rating is maintained in accordance with this code. Fire dampers shall not be installed in clothes dryer exhaust duct systems.
Exhaust ducts for clothes dryers shall terminate on the outside of the building and shall be equipped with a backdraft damper. Screens shall not be installed at the duct termination. Ducts shall not be connected or installed with sheet metal screws or other fasteners that will obstruct the flow. Clothes dryer exhaust ducts shall not be connected to a vent connector, vent or chimney. Clothes dryer exhaust ducts shall not extend into or through ducts or plenums. Clothes dryer exhaust ducts shall be sealed in accordance with Section M1601.4.1.
The passageway of dryer exhaust duct terminals shall be undiminished in size and shall provide an open area of not less than 12.5 square inches (8065 mm2).
Domestic dryer exhaust duct power ventilators shall be listed and labeled to UL 705 for use in dryer exhaust duct systems. The dryer exhaust duct power ventilator shall be installed in accordance with the manufacturer's instructions.
Installations exhausting more than 200 cfm (0.09 m3/s) shall be provided with makeup air.
Where a closet is designed for the installation of a clothes dryer, an opening having an area of not less than 100 square inches (645 mm2) for makeup air shall be provided in the closet enclosure, or makeup air shall be provided by other approved means.
UpCodes Diagram (1)
Protective shield plates shall be placed where nails or screws from finish or other work are likely to penetrate the clothes dryer exhaust duct. Shield plates shall be placed on the finished face of all framing members where there is less than 11/4 inches (32 mm) between the duct and the finished face of the framing member. Protective shield plates shall be constructed of steel, shall have a minimum thickness of 0.062 inch (1.6 mm) and shall extend not less than 2 inches (51 mm) above sole plates and below top plates.
Exhaust ducts for domestic clothes dryers shall conform to the requirements of Sections G2439.7.1 through G2439.7.6.
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Exhaust ducts shall have a smooth interior finish and shall be constructed of metal not less than 0.016-inch (0.4 mm) in thickness. The exhaust duct size shall be 4 inches (102 mm) nominal in diameter.
Exhaust ducts shall be supported at 4-foot (1219 mm) intervals and secured in place. The insert end of the duct shall extend into the adjoining duct or fitting in the direction of airflow. Ducts shall not be joined with screws or similar fasteners that protrude more than 1/8 inch (3.2 mm) into the inside of the duct. Where dryer exhaust ducts are enclosed in wall or ceiling cavities, such cavities shall allow the installation of the duct without deformation.
Transition ducts used to connect the dryer to the exhaust duct system shall be a single length that is listed and labeled in accordance with UL 2158A. Transition ducts shall be not more than 8 feet (2438 mm) in length and shall not be concealed within construction.
The maximum allowable exhaust duct length shall be determined by one of the methods specified in Sections G2439.7.4.1 through G2439.7.4.3.
The maximum length of the exhaust duct shall be 35 feet (10 668 mm) from the connection to the transition duct from the dryer to the outlet terminal. Where fittings are used, the maximum length of the exhaust duct shall be reduced in accordance with Table G2439.7.4.1.
TABLE G2439.7.4.1 (TABLE 614.9.4.1)
DRYER EXHAUST DUCT FITTING EQUIVALENT LENGTH
| DRYER EXHAUST DUCT FITTING TYPE | EQUIVALENT LENGTH |
| 4 inch radius mitered 45-degree elbow | 2 feet 6 inches |
| 4 inch radius mitered 90-degree elbow | 5 feet |
| 6 inch radius smooth 45-degree elbow | 1 foot |
| 6 inch radius smooth 90-degree elbow | 1 foot 9 inches |
| 8 inch radius smooth 45-degree elbow | 1 foot |
| 8 inch radius smooth 90-degree elbow | 1 foot 7 inches |
| 10 inch radius smooth 45-degree elbow | 9 inches |
| 10 inch radius smooth 90-degree elbow | 1 foot 6 inches |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 degree = 0.0175 rad.
The maximum length of the exhaust duct shall be determined by the dryer manufacturer's installation instructions. The code official shall be provided with a copy of the installation instructions for the make and model of the dryer. Where the exhaust duct is to be concealed, the installation instructions shall be provided to the code official prior to the concealment inspection. In the absence of fitting equivalent length calculations from the clothes dryer manufacturer, Table G2439.7.4.1 shall be utilized.
The maximum length of the exhaust duct shall be determined by the dryer exhaust duct power ventilator manufacturer's installation instructions.
Where the exhaust duct equivalent length exceeds 35 feet (10 668 mm), the equivalent length of the exhaust duct shall be identified on a permanent label or tag. The label or tag shall be located within 6 feet (1829 mm) of the exhaust duct connection
Where space for a clothes dryer is provided, an exhaust duct system shall be installed.
Where the clothes dryer is not installed at the time of occupancy, the exhaust duct shall be capped at the location of the future dryer.
Exception: Where a listed condensing clothes dryer is installed prior to occupancy of the structure.
UpCodes Diagram (1)
Sauna heaters shall be installed in accordance with the manufacturer's instructions.
Sauna heaters shall be located so as to minimize the possibility of accidental contact by a person in the room.
Panels, grilles and access doors that are required to be removed for normal servicing operations, shall not be attached to the building.
Sauna heaters of other than the direct-vent type shall be installed with the draft hood and combustion air intake located outside the sauna room. Where the combustion air inlet and the draft hood are in a dressing room adjacent to the sauna room, there shall be provisions to prevent physically blocking the combustion air inlet and the draft hood inlet, and to prevent physical contact with the draft hood and vent assembly, or warning notices shall be posted to avoid such contact. Any warning notice shall be easily readable, shall contrast with its background and the wording shall be in letters not less than 1/4 inch (6.4 mm) high.
Combustion air shall not be taken from inside the sauna room. Combustion and ventilation air for a sauna heater not of the direct-vent type shall be provided to the area in which the combustion air inlet and draft hood are located in accordance with Section G2407.
Sauna heaters shall be equipped with a thermostat that will limit room temperature to 194°F (90°C). If the thermostat is not an integral part of the sauna heater, the heat-sensing element shall be located within 6 inches (152 mm) of the ceiling. If the heat-sensing element is a capillary tube and bulb, the assembly shall be attached to the wall or other support, and shall be protected against physical damage.
A timer, if provided to control main burner operation, shall have a maximum operating time of 1 hour. The control for the timer shall be located outside the sauna room.
A ventilation opening into the sauna room shall be provided. The opening shall be not less than 4 inches by 8 inches (102 mm by 203 mm) located near the top of the door into the sauna room.
Pool and spa heaters shall be listed in accordance with ANSI Z21.56/CSA 4.7 and shall be installed in accordance with the manufacturer's instructions.
Volume dampers shall not be placed in the air inlet to a furnace in a manner that will reduce the required air to the furnace.
Outdoor or return air for forced-air heating and cooling systems shall not be taken from the following locations:
- Closer than 10 feet (3048 mm) from an appliance vent outlet, a vent opening from a plumbing drainage system or the discharge outlet of an exhaust fan, unless the outlet is 3 feet (914 mm) above the outside air inlet.
- Where there is the presence of objectionable odors, fumes or flammable vapors; or where located less than 10 feet (3048 mm) above the surface of any abutting public way or driveway; or where located at grade level by a sidewalk, street, alley or driveway.
- A hazardous or insanitary location or a refrigeration machinery room as defined in the Florida Building Code, Mechanical.
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A room or space, the volume of which is less than 25 percent of the entire volume served by such system. Where connected by a permanent opening having an area sized in accordance with this code, adjoining rooms or spaces shall be considered to be a single room or space for the purpose of determining the volume of such rooms or spaces.Exception: The minimum volume requirement shall not apply where the amount of return air taken from a room or space is less than or equal to the amount of supply air delivered to such room or space.
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A room or space containing an appliance where such a room or space serves as the sole source of return air.Exceptions: This shall not apply where:
- The appliance is a direct-vent appliance or an appliance not requiring a vent in accordance with Section G2425.8.
- The room or space complies with the following requirements:
- The return air shall be taken from a room or space having a volume exceeding 1 cubic foot for each 10 Btu/h (9.6 L/W) of combined input rating of all fuel-burning appliances therein.
- The volume of supply air discharged back into the same space shall be approximately equal to the volume of return air taken from the space.
- Return-air inlets shall not be located within 10 feet (3048 mm) of a draft hood in the same room or space or the combustion chamber of any atmospheric burner appliance in the same room or space.
- Rooms or spaces containing solid fuel-burning appliances, provided that return-air inlets are located not less than 10 feet (3048 mm) from the firebox of such appliances.
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Exceptions:
- Where return air intakes are located not less than 10 feet (3048 mm) from cooking appliances and serve only the kitchen area, taking return air from a kitchen area shall not be prohibited.
- Dedicated forced air systems serving only a garage shall not be prohibited from obtaining return air from the garage.
- A crawl space by means of direct connection to the return side of a forced-air system. Transfer openings in the crawl space enclosure shall not be prohibited.
Required outdoor air inlets shall be covered with a screen having 1/4-inch (6.4 mm) openings.
The installation of conversion burners shall conform to ANSI Z21.8.
Unit heaters shall be listed in accordance with ANSI Z83.8/CSA 2.6 and shall be installed in accordance with the manufacturer's instructions.
Suspended-type unit heaters shall be supported by elements that are designed and constructed to accommodate the weight and dynamic loads. Hangers and brackets shall be of noncombustible material.
Ducts shall not be connected to a unit heater unless the heater is listed for such installation.
Suspended-type unit heaters shall be installed with clearances to combustible materials of not less than 18 inches (457 mm) at the sides, 12 inches (305 mm) at the bottom and 6 inches (152 mm) above the top where the unit heater has an internal draft hood or 1 inch (25 mm) above the top of the sloping side of the vertical draft hood.
Floor-mounted-type unit heaters shall be installed with clearances to combustible materials at the back and one side only of not less than 6 inches (152 mm). Where the flue gases are vented horizontally, the 6-inch (152 mm) clearance shall be measured from the draft hood or vent instead of the rear wall of the unit heater. Floor-mounted-type unit heaters shall not be installed on combustible floors unless listed for such installation.
Clearances for servicing all unit heaters shall be in accordance with the manufacturer's installation instructions.
Exception: Unit heaters listed for reduced clearance shall be permitted to be installed with such clearances in accordance with their listing and the manufacturer's instructions.
Unvented room heaters shall be listed in accordance with ANSI Z21.11.2 and shall be installed in accordance with the conditions of the listing and the manufacturer's instructions.
One or more unvented room heaters shall not be used as the sole source of comfort heating in a dwelling unit.
Unvented room heaters shall not have an input rating in excess of 40,000 Btu/h (11.7 kW).
The location of unvented room heaters shall comply with Section G2406.2.
The aggregate input rating of all unvented appliances installed in a room or space shall not exceed 20 Btu/h per cubic foot (207 W/m3) of volume of such room or space. Where the room or space in which the appliances are installed is directly connected to another room or space by a doorway, archway or other opening of comparable size that cannot be closed, the volume of such adjacent room or space shall be permitted to be included in the calculations.
Unvented room heaters shall be equipped with an oxygen-depletion-sensitive safety shutoff system. The system shall shut off the gas supply to the main and pilot burners when the oxygen in the surrounding atmosphere is depleted to the percent concentration specified by the manufacturer, but not lower than 18 percent. The system shall not incorporate field adjustment means capable of changing the set point at which the system acts to shut off the gas supply to the room heater.
An unvented decorative room heater shall not be installed in a factory-built fireplace unless the fireplace system has been specifically tested, listed and labeled for such use in accordance with UL 127.
Ventless firebox enclosures used with unvented decorative room heaters shall be listed as complying with ANSI Z21.91.
Vented room heaters shall be listed in accordance with ANSI Z21.86/CSA 2.32, shall be designed and equipped as specified in Section G2432.2 and shall be installed in accordance with the manufacturer's instructions.
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Cooking appliances that are designed for permanent installation, including ranges, ovens, stoves, broilers, grills, fryers, griddles, hot plates and barbecues, shall be listed in accordance with ANSI Z21.1 or ANSI Z21.58/CSA 1.6 and shall be installed in accordance with the manufacturer's instructions.
Cooking appliances designed, tested, listed and labeled for use in commercial occupancies shall not be installed within dwelling units or within any area where domestic cooking operations occur.
Cooking appliances installed within dwelling units and within areas where domestic cooking operations occur shall be listed and labeled as household-type appliances for domestic use.
Ranges installed on combustible floors shall be set on their own bases or legs and shall be installed with clearances of not less than that shown on the label.
Household cooking appliances shall have a vertical clearance above the cooking top of not less than 30 inches (760 mm) to combustible material and metal cabinets. A minimum clearance of 24 inches (610 mm) is permitted where one of the following is installed:
- The underside of the combustible material or metal cabinet above the cooking top is protected with not less than 1/4-inch (6.4 mm) insulating millboard covered with sheet metal not less than 0.0122 inch (0.3 mm) thick.
- A metal ventilating hood constructed of sheet metal not less than 0.0122 inch (0.3 mm) thick is installed above the cooking top with a clearance of not less than 1/4 inch (6.4 mm) between the hood and the underside of the combustible material or metal cabinet. The hood shall have a width not less than the width of the appliance and shall be centered over the appliance.
- A listed cooking appliance or microwave oven is installed over a listed cooking appliance and in compliance with the terms of the manufacturer's installation instructions for the upper appliance.
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Water heaters shall be listed in accordance with ANSI Z21.10.1/CSA 4.1 or ANSI Z21.10.3/CSA 4.3 and shall be installed in accordance with the manufacturer's instructions.
The requirements for water heaters relative to sizing, relief valves, drain pans and scald protection shall be in accordance with this code.
Water heaters utilized both to supply potable hot water and provide hot water for space-heating applications shall be listed and labeled for such applications by the manufacturer and shall be installed in accordance with the manufacturer's instructions and this code.
Gas-fired air-conditioning appliances shall be listed in accordance with ANSI Z21.40.1/CSA 2.91 or ANSI Z21.40.2/CSA 2.92 and shall be installed in accordance with the manufacturer's instructions.
Gas piping serving heating appliances shall be permitted to also serve cooling appliances where such heating and cooling appliances cannot be operated simultaneously (see Section G2413).
To protect against the effects of normal vibration in service, gas engines shall not be rigidly connected to the gas supply piping.
Air conditioning appliances shall be installed in accordance with the manufacturer's instructions. Unless the appliance is listed for installation on a combustible surface such as a floor or roof, or unless the surface is protected in an approved manner, the appliance shall be installed on a surface of noncombustible construction with noncombustible material and surface finish, and combustible material shall not be against the underside thereof.
Illuminating appliances shall be listed in accordance with ANSI Z21.42 and shall be installed in accordance with the manufacturer's instructions.
Illuminating appliances designed for wall or ceiling mounting shall be securely attached to substantial structures in such a manner that they are not dependent on the gas piping for support.
Illuminating appliances designed for post mounting shall be securely and rigidly attached to a post. Posts shall be rigidly mounted. The strength and rigidity of posts greater than 3 feet (914 mm) in height shall be at least equivalent to that of a 21/2-inch-diameter (64 mm) post constructed of 0.064-inch-thick (1.6 mm) steel or a 1-inch (25 mm) Schedule 40 steel pipe. Posts 3 feet (914 mm) or less in height shall not be smaller than a 3/4-inch (19.1 mm) Schedule 40 steel pipe. Drain openings shall be provided near the base of posts where there is a possibility of water collecting inside them.
Where an appliance pressure regulator is not supplied with an illuminating appliance and the service line is not equipped with a service pressure regulator, an appliance pressure regulator shall be installed in the line to the illuminating appliance. For multiple installations, one regulator of adequate capacity shall be permitted to serve more than one illuminating appliance.
Infrared radiant heaters shall be listed in accordance with ANSI Z83.19 or Z83.20 and shall be installed in accordance with the manufacturer's instructions.
Infrared radiant heaters shall be fixed in a position independent of gas and electric supply lines. Hangers and brackets shall be of noncombustible material.
Boilers shall be listed in accordance with the requirements of ANSI Z21.13/CSA 4.9 or UL 795. If applicable, the boiler shall be designed and constructed in accordance with the requirements of ASME CSD-1 and as applicable, the ASME Boiler and Pressure Vessel Code, Sections I, II, IV, V and IX and NFPA 85.
In addition to the requirements of this code, the installation of boilers shall be in accordance with the manufacturer's instructions. Operating instructions of a permanent type shall be attached to the boiler. Boilers shall have all controls set, adjusted and tested by the installer. A complete control diagram together with complete boiler operating instructions shall be furnished by the installer. The manufacturer's rating data and the nameplate shall be attached to the boiler.
Permanently fixed-in-place outdoor decorative appliances shall be listed in accordance with ANSI Z21.97 and shall be installed in accordance with the manufacturer's instructions.