CODES

ADOPTS WITH AMENDMENTS:

International Residential Code 2012 (IRC 2012)

Copyright

Preface

Chapter 1 Administration

Chapter 2 Definitions

Chapter 3 Building Planning

Chapter 4 Foundations

Chapter 5 Floors

Chapter 6 Wall Construction

Chapter 7 Wall Covering

Chapter 8 Roof-Ceiling Construction

Chapter 9 Roof Assemblies

Chapter 10 Chimneys and Fireplaces

Chapter 11 [Re] Energy Efficiency

Chapter 12 Mechanical Administration

Chapter 13 General Mechanical System Requirements

Chapter 14 Heating and Cooling Equipment and Appliances

Chapter 15 Exhaust Systems

Chapter 16 Duct Systems

Chapter 17 Combustion Air

Chapter 18 Chimneys and Vents

Chapter 19 Special Appliances, Equipment and Systems

Chapter 20 Boilers and Water Heaters

Chapter 21 Hydronic Piping

Chapter 22 Special Piping and Storage Systems

Chapter 23 Solar Energy Systems

Chapter 24 Fuel Gas

Chapter 25 Plumbing Administration

Chapter 26 General Plumbing Requirements

Chapter 27 Plumbing Fixtures

Chapter 28 Water Heaters

Chapter 29 Water Supply and Distribution

Chapter 30 Sanitary Drainage

Chapter 31 Vents

Chapter 32 Traps

Chapter 33 Storm Drainage

Chapter 34 General Requirements

Chapter 35 Electrical Definitions

Chapter 36 Services

Chapter 37 Branch Circuit and Feeder Requirements

Chapter 38 Wiring Methods

Chapter 39 Power and Lighting Distribution

Chapter 40 Devices and Luminaires

Chapter 41 Appliance Installation

Chapter 42 Swimming Pools

Chapter 43 Class 2 Remote-Control, Signaling and Power-Limited Circuits

Chapter 44 Referenced Standards

Appendix A Sizing and Capacities of Gas Piping

Appendix B Sizing of Venting Systems Serving Appliances Equipped With Draft Hoods, Category I Appliances, and Appliances Listed for Use With Type B Vents

Appendix C Exit Terminals of Mechanical Draft and Direct-Vent Venting Systems

Appendix D Recommended Procedure for Safety Inspection of an Existing Appliance Installation

Appendix E Manufactured Housing Used as Dwellings

Appendix F Radon Control Methods

Appendix H Patio Covers

Appendix K Sound Transmission

Appendix N Venting Methods

Appendix P Sizing of Water Piping System

Appendix Q Icc International Residential Code Electrical Provisions/ National Electrical Code Cross Reference

The text of this chapter is extracted from the 2012 edition of the International Fuel Gas Code and has been modified where necessary to conform to the scope of application of the International Residential Code for One- and Two-Family Dwellings. The section numbers appearing in parentheses after each section number are the section numbers of the corresponding text in the International Fuel Gas Code.

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 International Fuel Gas Code 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 International Fuel Gas Code.

Gaseous hydrogen systems shall be regulated by Chapter 7 of the International Fuel Gas Code.

This chapter shall not apply to the following:

  1. Liquified natural gas (LNG) installations.
  2. Temporary LP-gas piping for buildings under construction or renovation that is not to become part of the permanent piping system.
  3. 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.
  4. Portable LP-gas appliances and equipment of all types that is not connected to a fixed fuel piping system.
  5. Portable fuel cell appliances that are neither connected to a fixed piping system nor interconnected to a power grid.
  6. 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 International Building Code, International Fire Code, International Mechanical Code or International Plumbing Code, such terms shall have meanings ascribed to them as in those codes.

AIR CONDITIONING, GAS FIRED. A gas-burning, automatically operated appliance for supplying cooled and/or dehumidified air or chilled liquid.

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-HANDLING UNIT. A blower or fan used for the purpose of distributing supply air to a room, space or area.

AIR, MAKEUP. Air that is provided to replace air being exhausted.

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 raw material to produce light, heat, power, refrigeration or air conditioning.

APPLIANCE, AUTOMATICALLY CONTROLLED. Appliances equipped with an automatic burner ignition and safety shut-off device and other automatic devices, which 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 or other authority having jurisdiction.

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.

BOILER, LOW-PRESSURE. A self-contained gas-fired appliance for supplying steam or hot water.

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 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.

CLOTHES DRYER. An appliance used to dry wet laundry by means of heated air.

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 CHAMBER. The portion of an appliance within which combustion occurs.

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.

CONCEALED PIPING. Piping that is located in a concealed location (see “Concealed location”).

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.

CONNECTOR, CHIMNEY OR VENT. The pipe that connects an appliance to a chimney or vent.

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.

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 GAS APPLIANCE, VENTED. A vented appliance wherein the primary function lies in the aesthetic effect of the flames.

DECORATIVE GAS 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.

DILUTION AIR. Air that is introduced into a draft hood and is mixed with the flue gases.

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 (1) provide for ready escape of the flue gases from the appliance in the event of no draft, backdraft, or stoppage beyond the draft hood, (2) prevent a backdraft from entering the appliance, and (3) 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.

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.

Factory-built fireplace. A fireplace composed of listed factory-built components assembled in accordance with the terms of listing to form the completed fireplace.

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:

  1. The area within a floodplain subject to a 1 percent or greater chance of flooding in any given year.
  2. 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 GASES. Products of combustion plus excess air in appliance flues or heat exchangers.

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.

FUEL GAS UTILIZATION EQUIPMENT. See “Appliance.”

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 FURNACE. 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 which 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 gas 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 International Building Code 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 which 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 press 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 which forms a continuous bond between the mating surfaces without dissolving either one of them.

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.

LIVING SPACE. Space within a dwelling unit utilized for living, sleeping, eating, cooking, bathing, washing and sanitation purposes.

LOG LIGHTER, GAS-FIRED. 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, when tested in accordance with ASTM E 136, have at least three of four specimens tested meeting all of the following criteria:

  1. 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.
  2. There shall not be flaming from the specimen after the first 30 seconds.
  3. 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.

OUTLET. The point at which a gas-fired appliance connects to the gas piping system.

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.

PILOT. A small flame that is utilized to ignite the gas at the main burner or burners.

PIPING. Where used in this code, “piping” refers to either pipe or tubing, or both.

Pipe. A rigid conduit of iron, steel, copper, brass or plastic.

Tubing. Semirigid conduit of copper, aluminum, plastic or steel.

PIPING SYSTEM. All 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 valve is provided at 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.

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, 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 which opens and closes a relief vent, depending on whether the pressure is above or below a predetermined value.

RELIEF VALVE, TEMPERATURE.

Manual reset type. A valve which automatically opens a relief vent at a predetermined temperature and which must be manually returned to the closed position.

Reseating or self-closing type. An automatic valve which 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.

RISER, GAS. A vertical pipe supplying fuel gas.

ROOM HEATER, UNVENTED. See “Unvented room heater.”

ROOM HEATER, VENTED. A free-standing gas-fired heating unit used for direct heating of the space in and adjacent to that in which the unit is located. (See also “Vented room heater.”)

SAFETY SHUTOFF DEVICE. See “Flame safeguard.”

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.

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.

  1. 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.
  2. 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.

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.

High-static pressure type. A self-contained, automatically controlled, vented appliance having integral means for circulation of air against 0.2 inch w.c. (50 Pa) or greater static pressure. Such appliance is equipped with provisions for attaching an outlet air duct and, where the appliance is for indoor installation remote from the space to be heated, is also equipped with provisions for attaching an inlet air duct.

Low-static pressure type. A self-contained, automatically controlled, vented appliance, intended for installation in the space to be heated without the use of ducts, having integral means for circulation of air. Such units are allowed to be equipped with louvers or face extensions made in accordance with the manufacturer’s specifications.

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.

Individual main burner. A valve that controls the gas supply to an individual main burner.

Main burner control. A valve that controls the gas supply to the main burner manifold.

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 a pilot or pilots that have 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 service meter or source of supply and the customer piping system, 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 BW vent. A vent listed and labeled for use with wall furnaces.

Type L vent. A vent listed and labeled for use with appliances that are listed for use with Type L or Type B vents.

VENT CONNECTOR. See “Connector.”

VENT PIPING.

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 GAS 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 outside 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.

WATER HEATER. Any heating appliance or equipment that heats potable water and supplies such water to the potable hot water distribution system.

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.

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 R104.11. The approval of unlisted appliances in accordance with Section R104.11 shall be based upon approved engineering evaluation.
Where means for isolation of vibration of an appliance is installed, an approved means for support and restraint of that appliance shall be provided.
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.

When earthquake loads are applicable in accordance with this code, the supports shall be designed and installed for the seismic forces in accordance with this code.
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.

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 which are 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 (e.g., HVAC equipment, 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:

  1. The appliance is a direct-vent appliance installed in accordance with the conditions of the listing and the manufacturer’s instructions.
  2. 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.
  3. 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.
  4. 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.
  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. All combustion air shall be taken directly from the outdoors in accordance with Section G2407.6.
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 and vented gas appliances other than Category I 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 G2439.4.

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 so as 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.
The minimum required volume shall be 50 cubic feet per 1,000 Btu/h (4.8 m3/kW).

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)

Each opening shall have a minimum free area of 1 square inch per 1,000 Btu/h (2,200 mm2/kW) of the total input rating of all appliances in the space, but not less than 100 square inches (0.06 m2). One opening shall commence within 12 inches (305 mm) of the top and one 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 as communicating spaces where such spaces are connected by one or more 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).

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 (1,100 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)]

ALL AIR FROM OUTDOOR-INLET AIR FROM VENTILATED CRAWL SPACE AND OUTLET AIR TO VENTILATED ATTIC (see Section G2407.6.1)

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 at least 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:

  1. The ratio of interior spaces shall be the available volume of all communicating spaces divided by the required volume.
  2. The outdoor size reduction factor shall be one minus the ratio of interior spaces.
  3. 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 and shall be approved.
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:

  1. Ducts shall be constructed of galvanized steel complying with Chapter 16 or of a material having equivalent corrosion resistance, strength and rigidity.
  2. 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.

  3. Ducts shall terminate in an unobstructed space allowing free movement of combustion air to the appliances.
  4. Ducts shall serve a single enclosure.
  5. 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.
  6. Ducts shall not be screened where terminating in an attic space.
  7. Horizontal upper combustion air ducts shall not slope downward toward the source of combustion air.
  8. 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.
  9. Exception: Direct-vent gas-fired appliances designed for installation in a solid fuel-burning fireplace where installed in accordance with the manufacturer’s instructions.

  10. 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 installation 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 installation 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 an assembly listed for such application. 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), G2409.2(2) and G2409.2(3)].

NOTES:

“A” equals the clearance with no protection.

“B” equals 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)]

EXTENT OF PROTECTION NECESSARY TO REDUCE CLEARANCES FROM GAS EQUIPMENT OR VENT CONNECTORS

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)]

MASONRY CLEARANCE REDUCTION SYSTEM

TABLE G2409.2 (308.2)a through k

REDUCTION OF CLEARANCES WITH SPECIFIED FORMS OF PROTECTION

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)
36181296
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
2412965
2. 1/2-inch insulation board over 1-inch glass
fiber or mineral wool batts
2418129966543
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
181296645333
4. 31/2-inch-thick masonry wall with ventilated
airspace
126666
5. 0.024-inch (nominal 24 gage) sheet metal
with ventilated airspace
181296645332
6. 1/2-inch-thick insulation board with ventilated
airspace
181296645333
7. 0.024-inch (nominal 24 gage) sheet metal
with ventilated airspace over 0.024-inch
(nominal 24 gage) sheet metal with ventilated
airspace
181296645333
8. 1-inch glass fiber or mineral wool batts
sandwiched between two sheets 0.024-inch
(nominal 24 gage) sheet metal with ventilated
airspace
181296645333

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.

  1. Reduction of clearances from combustible materials shall not interfere with combustion air, draft hood clearance and relief, and accessibility of servicing.
  2. All 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.
  3. Spacers and ties shall be of noncombustible material. No spacer or tie shall be used directly opposite an appliance or connector.
  4. 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)].
  5. There shall be at least 1 inch between clearance reduction systems and combustible walls and ceilings for reduction systems using ventilated airspace.
  6. 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.
  7. Mineral wool batts (blanket or board) shall have a minimum density of 8 pounds per cubic foot and a minimum melting point of 1,500°F.
  8. 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.
  9. There shall be at least 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.
  10. All clearances and thicknesses are minimum; larger clearances and thicknesses are acceptable.
  11. Listed single-wall connectors shall be installed in accordance with the manufacturer’s installation 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.
Supply air ducts connecting to listed central heating furnaces shall have the same minimum clearance to combustibles as required for the furnace supply plenum for a distance of not less than 3 feet (914 mm) from the supply plenum. Clearance is not required beyond the 3-foot (914 mm) distance.
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.
Supply air ducts connecting to listed central heating furnaces shall have the same minimum clearance to combustibles as required for the furnace supply plenum for a distance of not less than 3 feet (914 mm) from the supply plenum. Clearance is not required beyond the 3-foot (914 mm) distance.
Front clearance shall be sufficient for servicing the burner and the furnace or boiler.
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 Chapters 34 through 43.
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 appliances that are connected to the equipment grounding conductor of the circuit supplying that appliance.
Corrugated stainless steel tubing (CSST) gas piping systems shall be bonded to the electrical service grounding electrode system. The bonding jumper shall connect to a metallic pipe or fitting between the point of delivery and the first downstream CSST fitting. The bonding jumper shall be not smaller than 6 AWG copper wire or equivalent. Gas piping systems that contain one or more segments of CSST shall be bonded in accordance with this section.
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 International Fire 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, 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 pipe located in the same room as the appliance served.
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.
All 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.
Each length of pipe and tubing and each pipe fitting, utilized in a fuel gas system, shall bear the identification of the manufacturer.
All piping, tubing and fittings shall comply with the applicable referenced standards, specifications and performance criteria of this code and shall be identified in accordance with Section G2412.9. Piping, tubing and fittings shall either be tested by an approved third-party testing agency or certified by an approved third-party certification agency.
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, in cubic feet per hour, shall be calculated using the manufacturer’s input ratings of the appliances served adjusted for altitude. Where an input rating is not indicated, the gas supplier, appliance manufacturer or a qualified agency shall be contacted, or the rating from Table G2413.2 shall be used for estimating the volumetric flow rate of gas to be supplied.

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.

TABLE G2413.2(402.2)

APPROXIMATE GAS INPUT FOR TYPICAL APPLIANCES

APPLIANCEINPUT BTU/H
(Approx.)
Space Heating Units
Hydronic boiler
Single family100,000
Multifamily, per unit60,000
Warm-air furnace
Single family100,000
Multifamily, per unit60,000
Space and Water Heating Units
Hydronic boiler
Single family120,000
Multifamily, per unit75,000
Water Heating Appliances
Water heater, automatic instantaneous
Capacity at 2 gal./minute142,800
Capacity at 4 gal./minute285,000
Capacity at 6 gal./minute428,400
Water heater, automatic storage, 30- to 40-gal. tank35,000
Water heater, automatic storage, 50-gal. tank50,000
Water heater, domestic, circulating or side-arm35,000
Cooking Appliances
Built-in oven or broiler unit, domestic25,000
Built-in top unit, domestic40,000
Range, free-standing, domestic65,000
Other Appliances
Barbecue40,000
Clothes dryer, Type 1 (domestic)35,000
Gas fireplace, direct-vent40,000
Gas light2,500
Gas log80,000
Refrigerator3,000

For SI: 1 British thermal unit per hour = 0.293 W, 1 gallon = 3.785 L, 1 gallon per minute = 3.785 L/m.

Gas piping shall be sized in accordance with one of the following:

  1. Pipe sizing tables or sizing equations in accordance with Section G2413.4.
  2. The sizing tables included in a listed piping system’s manufacturer’s installation instructions.
  3. Other approved engineering methods.

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.

  1. Low-pressure gas equation [Less than 1.5 pounds per square inch (psi) (10.3 kPa)]:

    (Equation 24-3)

  2. High-pressure gas equation [1.5 psi (10.3 kPa) and above]:

    (Equation 24-4)

where:

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.
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

GASEQUATION FACTORS
CrY
Natural gas0.60940.9992
Undiluted propane1.24620.9910

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

GasNatural
Inlet PressureLess than 2 psi
Pressure Drop0.5 in. w.c.
Specific Gravity0.60
PIPE SIZE (inch)
Nominal1/23/4111/411/2221/2345681012
Actual ID0.6220.8241.0491.3801.6102.0672.4693.0684.0265.0476.0657.98110.02011.938
Length (ft)Capacity in Cubic Feet of Gas per Hour
101723606781,3902,0904,0206,40011,30023,10041,80067,600139,000252,000399,000
201182474669571,4302,7604,4007,78015,90028,70046,50095,500173,000275,000
30951993747681,1502,2203,5306,25012,70023,00037,30076,700139,000220,000
40811703206579851,9003,0205,35010,90019,70031,90065,600119,000189,000
50721512845838731,6802,6804,7409,66017,50028,30058,200106,000167,000
60651372575287911,5202,4304,2908,76015,80025,60052,70095,700152,000
70601262374867281,4002,2303,9508,05014,60023,60048,50088,100139,000
80561172204526771,3002,0803,6707,49013,60022,00045,10081,900130,000
90521102074246351,2201,9503,4507,03012,70020,60042,30076,900122,000
100501041954006001,1601,8403,2606,64012,00019,50040,00072,600115,000
12544921733555321,0201,6302,8905,89010,60017,20035,40064,300102,000
15040831573224829281,4802,6105,3309,65015,60032,10058,30092,300
17537771442964438541,3602,4104,9108,88014,40029,50053,60084,900
20034711342754127941,2702,2404,5608,26013,40027,50049,90079,000
25030631192443667041,1201,9804,0507,32011,90024,30044,20070,000
30027571082213316381,0201,8003,6706,63010,70022,10040,10063,400
3502553992033055879351,6503,3706,1009,88020,30036,90058,400
4002349921892835468701,5403,1405,6809,19018,90034,30054,300
4502246861772665128161,4402,9405,3308,62017,70032,20050,900
5002143821682514847711,3602,7805,0308,15016,70030,40048,100
5502041781592394597321,2902,6404,7807,74015,90028,90045,700
6001939741522284386991,2402,5204,5607,38015,20027,50043,600
6501838711452184206691,1802,4104,3607,07014,50026,40041,800
7001736681402094036431,1402,3204,1906,79014,00025,30040,100
7501735661352023896191,0902,2304,0406,54013,40024,40038,600
8001634631301953755981,0602,1603,9006,32013,00023,60037,300
8501633611261893635791,0202,0903,7806,11012,60022,80036,100
9001532591221833525619922,0203,6605,93012,20022,10035,000
9501531581181783425459631,9603,5505,76011,80021,50034,000
1,0001430561151733335309371,9103,4605,60011,50020,90033,100
1,1001428531091643165038901,8103,2805,32010,90019,80031,400
1,2001327511041563014808491,7303,1305,07010,40018,90030,000
1,3001226491001502894608131,6603,0004,8609,98018,10028,700
1,400122547961442774427811,5902,8804,6709,59017,40027,600
1,500112445931392674267521,5302,7804,5009,24016,80026,600
1,600112344891342584117271,4802,6804,3408,92016,20025,600
1,700112242861302503987031,4302,5904,2008,63015,70024,800
1,800102241841262423866821,3902,5204,0708,37015,20024,100
1,900102140811222353756621,3502,4403,9608,13014,80023,400
2,000NA2039791192293646441,3102,3803,8507,91014,40022,700

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:

  1. NA means a flow of less than 10 cfh.
  2. All table entries have been rounded to three significant digits.

TABLE G2413.4(2) [402.4(5)]

SCHEDULE 40 METALLIC PIPE

GasNatural
Inlet Pressure2.0 psi
Pressure Drop1.0 psi
Specific Gravity0.60
PIPE SIZE (inch)
Nominal1/23/4111/411/2221/234
Actual ID0.6220.8241.0491.3801.6102.0672.4693.0684.026
Length (ft)Capacity in Cubic Feet of Gas per Hour
101,5103,0405,56011,40017,10032,90052,50092,800189,000
201,0702,1503,9308,07012,10023,30037,10065,600134,000
308691,7603,2106,5909,88019,00030,30053,600109,000
407531,5202,7805,7108,55016,50026,30046,40094,700
506731,3602,4905,1107,65014,70023,50041,50084,700
606151,2402,2704,6606,98013,50021,40037,90077,300
705691,1502,1004,3206,47012,50019,90035,10071,600
805321,0801,9704,0406,05011,70018,60032,80067,000
905021,0101,8503,8105,70011,00017,50030,90063,100
1004629341,7103,5105,26010,10016,10028,50058,200
1254148361,5303,1404,7009,06014,40025,50052,100
1503727511,3702,8204,2208,13013,00022,90046,700
1753446951,2702,6013,9107,53012,00021,20043,300
2003186421,1702,4103,6106,96011,10019,60040,000
2502795831,0402,1403,2106,1809,85017,40035,500
3002535289451,9402,9105,6008,92015,80032,200
3502324868691,7902,6705,1508,21014,50029,600
4002164528091,6602,4904,7907,64013,50027,500
4502034247591,5602,3304,5007,17012,70025,800
5001924017171,4702,2104,2506,77012,00024,400
5501823816811,4002,0904,0306,43011,40023,200
6001743636501,3302,0003,8506,13010,80022,100
6501663486221,2801,9103,6805,87010,40021,200
7001603345981,2301,8403,5405,6409,97020,300
7501543225761,1801,7703,4105,4409,61019,600
8001493115561,1401,7103,2905,2509,28018,900
8501443015381,1001,6503,1905,0808,98018,300
9001392925221,0701,6003,0904,9308,71017,800
9501352835071,0401,5603,0004,7808,46017,200
1,0001322754931,0101,5202,9204,6508,22016,800
1,1001252624689601,4402,7704,4207,81015,900
1,2001192504469171,3702,6404,2207,45015,200
1,3001142394278781,3202,5304,0407,14014,600
1,4001102304118431,2602,4303,8806,86014,000
1,5001062213968121,2202,3403,7406,60013,500
1,6001022143827841,1802,2603,6106,38013,000
1,700992073707591,1402,1903,4906,17012,600
1,800962003587361,1002,1203,3905,98012,200
1,900931953487151,0702,0603,2905,81011,900
2,000911893396951,0402,0103,2005,65011,500

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: All table entries have been rounded to three significant digits.

TABLE G2413.4(3) [402.4(9)]

SEMIRIGID COPPER TUBING

GasNatural
Inlet PressureLess than 2 psi
Pressure Drop0.5 in. w.c.
Specific Gravity0.60
TUBE SIZE (inch)
NominalK & L1/43/81/25/83/4111/411/22
ACR3/81/25/83/47/811/813/8
Outside0.3750.5000.6250.7500.8751.1251.3751.6252.125
Inside0.3050.4020.5270.6520.7450.9951.2451.4811.959
Length (ft)Capacity in Cubic Feet of Gas per Hour
1027551111952765901,0601,6803,490
201838771341904067301,1502,400
301530611071523265869251,930
40132653921312795027911,650
50112347821162474457011,460
60102142741052244036351,320
70NA193968962063715851,220
80NA183663901923455441,130
90NA173459841803245101,060
100NA163256791703064821,000
125NA14285070151271427890
150NA13264564136245387806
175NA12244159125226356742
200NA11223955117210331690
250NANA203448103186294612
300NANA18314494169266554
350NANA16284086155245510
400NANA15263880144228474
450NANA14253575135214445
500NANA13233371128202420
550NANA13223268122192399
600NANA12213064116183381
650NANA12202962111175365
700NANA11202859107168350
750NANA11192757103162338
800NANA1018265599156326
850NANA1018255396151315
900NANANA17245293147306
950NANANA17245090143297
1,000NANANA16234988139289
1,100NANANA15224684132274
1,200NANANA15214480126262
1,300NANANA14204276120251
1,400NANANA13194173116241
1,500NANANA13183971111232
1,600NANANA13183868108224
1,700NANANA12173766104217
1,800NANANA12173664101210
1,900NANANA1116356298204
2,000NANANA1116346095199

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:

  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. NA means a flow of less than 10 cfh.
  3. All table entries have been rounded to three significant digits.

TABLE G2413.4(4) [402.4(12)]

SEMIRIGID COPPER TUBING

GasNatural
Inlet Pressure2.0 psi
Pressure Drop1.0 psi
Specific Gravity0.60
TUBE SIZE (inch)
NominalK & L1/43/81/25/83/4111/411/22
ACR3/81/25/83/47/811/813/8
Outside0.3750.5000.6250.7500.8751.1251.3751.6252.125
Inside0.3050.4020.5270.6520.7450.9951.2451.4811.959
Length (ft)Capacity in Cubic Feet of Gas per Hour
102455061,0301,8002,5505,4509,82015,50032,200
201693487081,2401,7603,7506,75010,60022,200
301352795689931,4103,0105,4208,55017,800
401162394868501,2102,5804,6407,31015,200
501032124317541,0702,2804,1106,48013,500
60931923916839692,0703,7305,87012,200
70861773596288911,9003,4305,40011,300
80801643345848291,7703,1905,03010,500
90751543145487781,6602,9904,7209,820
100711462965187351,5702,8304,4509,280
125631292634596511,3902,5003,9508,220
150571172384165901,2602,2703,5807,450
175521082193835431,1602,0903,2906,850
200491002043565051,0801,9403,0606,380
25043891813154489561,7202,7105,650
30039801642864068661,5602,4605,120
35036741502633737971,4302,2604,710
40033691402453477411,3302,1004,380
45031651312303266961,2501,9704,110
50030611242173086571,1801,8703,880
55028581182062926241,1201,7703,690
60027551121962795951,0701,6903,520
65026531081882675701,0301,6203,370
70025511031812565489861,5503,240
75024491001742475289501,5003,120
8002347961682395109171,4503,010
8502246931632314938881,4002,920
9002244901582244788611,3602,830
9502143881532174648361,3202,740
1,0002042851492114528131,2802,670
1,1001940811422014297721,2202,540
1,2001838771351924097371,1602,420
1,3001836741291833927051,1102,320
1,4001735711241763766781,0702,230
1,5001634681201703636531,0302,140
1,6001633661161643506309942,070
1,7001531641121593396109622,000
1,8001530621081543295929331,940
1,9001430601051493195759061,890
2,0001429591021453105598811,830

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:

  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. All table entries have been rounded to three significant digits.

TABLE G2413.4(5) [402.4(15)]

CORRUGATED STAINLESS STEEL TUBING (CSST)

GasNatural
Inlet PressureLess than 2 psi
Pressure Drop0.5 in. w.c.
Specific Gravity0.60
TUBE SIZE (EHD)
Flow
Designation
1315181923253031373946486062
Length (ft)Capacity in Cubic Feet of Gas per Hour
546631151342252704715468951,0371,7902,0703,6604,140
10324482951611923303836397461,2601,4702,6002,930
15253566771321572673105246151,0301,2002,1402,400
20223158671161372312694565368881,0501,8502,080
25192752601041222062404094827939361,6601,860
3018254755961121882183744427238561,5201,700
401521414783971621883253866257421,3201,470
501319374275871441682923475596651,1801,320
601217343868801311532673185096081,0801,200
701116313663741211412482954715631,0001,110
801015293360691131322322774405279401,040
90101428325765107125219262415498887983
10091326305462101118208249393472843933
150710202342487891171205320387691762
20069182138447182148179277336600661
25058161934396374133161247301538591
3005715173236576795148226275492540

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:

  1. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/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 and/or bends.
  2. 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.
  3. All table entries have been rounded to three significant digits.

TABLE G2413.4(6) [402.4(18)]

CORRUGATED STAINLESS STEEL TUBING (CSST)

GasNatural
Inlet Pressure2.0 psi
Pressure Drop1.0 psi
Specific Gravity0.60
TUBE SIZE (EHD)
Flow
Designation
1315181923253031373946486062
Length (ft)Capacity in Cubic Feet of Gas Per Hour
102703535877001,1001,3702,5902,9904,5105,0379,60010,70018,60021,600
251662203744447098761,6201,8702,8903,2586,0406,78011,90013,700
301512003424056508011,4801,7002,6402,9875,5106,20010,90012,500
401291722973515676961,2701,4702,3002,6054,7605,3809,44010,900
501151542663145106241,1401,3102,0602,3434,2604,8208,4709,720
75931242182574205129221,0701,6901,9323,4703,9506,9407,940
80891202112494074968921,0301,6401,8743,3603,8206,7307,690
100791071892223664457959201,4701,6853,0003,4206,0306,880
15064871551823023646467481,2101,3892,4402,8004,9405,620
20055751351572633175576451,0501,2122,1102,4304,2904,870
25049671211412362844975769411,0901,8902,1803,8504,360
30044611101292172604535258629991,7201,9903,5203,980
4003852961111892253904537498711,4901,7303,0603,450
5003446861001702023484045527831,3301,5502,7403,090

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:

  1. 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.
  2. CAUTION: Capacities shown in the table might exceed maximum capacity for a selected regulator. Consult with the regulator or tubing manufacturer for guidance.
  3. Table includes losses for four 90-degree bends and two end fittings. Tubing runs with larger numbers of bends and/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 and/or bends.
  4. 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.
  5. All table entries have been rounded to three significant digits.

TABLE G2413.4(7) [402.4(21)]

POLYETHYLENE PLASTIC PIPE

GasNatural
Inlet PressureLess than 2 psi
Pressure Drop0.5 in. w.c.
Specific Gravity0.60
PIPE SIZE (in.)
Nominal OD1/23/4111/411/22
DesignationSDR 9.33SDR 11.0SDR 11.00SDR 10.00SDR 11.00SDR 11.00
Actual ID0.6600.8601.0771.3281.5541.943
Length (ft)Capacity in Cubic Feet of Gas per Hour
102014037261,2601,9003,410
201382774998651,3102,350
301112224016951,0501,880
40951903435948981,610
50841693045277961,430
60761532764777211,300
70701402544396631,190
80651312364096171,110
90611232213835791,040
10058116209362547983
12551103185321485871
1504693168291439789
1754386154268404726
2004080144249376675
2503571127221333598
3003264115200302542
3502959106184278499
400275599171258464
450265193160242435
500244888152229411

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: All table entries have been rounded to three significant digits.

TABLE G2413.4(8) [402.4(22)]

POLYETHYLENE PLASTIC PIPE

GasNatural
Inlet Pressure2.0 psi
Pressure Drop1.0 psi
Specific Gravity0.60
PIPE SIZE (in.)
Nominal OD1/23/4111/411/22
DesignationSDR 9.33SDR 11.0SDR 11.00SDR 10.00SDR 11.00SDR 11.00
Actual ID0.6600.8601.0771.3281.5541.943
Length (ft)Capacity in Cubic Feet of Gas per Hour
101,8603,7206,71011,60017,60031,600
201,2802,5604,6107,99012,10021,700
301,0302,0503,7106,4209,69017,400
408781,7603,1705,4908,30014,900
507781,5602,8104,8707,35013,200
607051,4102,5504,4106,66012,000
706491,3002,3404,0606,13011,000
806031,2102,1803,7805,70010,200
905661,1302,0503,5405,3509,610
1005351,0701,9303,3505,0509,080
1254749491,7102,9704,4808,050
1504298601,5502,6904,0607,290
1753957911,4302,4703,7306,710
2003687361,3302,3003,4706,240
2503266521,1802,0403,0805,530
3002955911,0701,8502,7905,010
3502725449811,7002,5704,610
4002535069131,5802,3904,290
4502374758561,4802,2404,020
5002244488091,4002,1203,800
5502134267681,3302,0103,610
6002034067331,2701,9203,440
6501943897021,2201,8403,300
7001873746741,1701,7603,170
7501803606491,1301,7003,050
8001743486271,0901,6402,950
8501683366071,0501,5902,850
9001633265881,0201,5402,770
9501583175729901,5002,690
1,0001543085569631,4502,610
1,1001462935289151,3802,480
1,2001392795048731,3202,370
1,3001342674828361,2602,270
1,4001282574638031,2102,180
1,5001242474467731,1702,100
1,6001192394317471,1302,030
1,7001152314177231,0901,960
1,8001122244047011,0601,900
1,9001092183936801,0301,850
2,0001062123826621,0001,800

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: All table entries have been rounded to three significant digits.

TABLE G2413.4(9) [402.4(25]

SCHEDULE 40 METALLIC PIPE

GasUndiluted Propane
Inlet Pressure10.0 psi
Pressure Drop1.0 psi
Specific Gravity1.50
INTENDED USEPipe sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator).
PIPE SIZE (in.)
Nominal1/23/4111/411/2221/234
Actual ID0.6220.8241.0491.3801.6102.0672.4693.0684.026
Length (ft)Capacity in Thousands of Btu per Hour
103,3206,95013,10026,90040,30077,600124,000219,000446,000
202,2804,7809,00018,50027,70053,30085,000150,000306,000
301,8303,8407,22014,80022,20042,80068,200121,000246,000
401,5703,2806,18012,70019,00036,60058,400103,000211,000
501,3902,9105,48011,30016,90032,50051,70091,500187,000
601,2602,6404,97010,20015,30029,40046,90082,900169,000
701,1602,4304,5709,38014,10027,10043,10076,300156,000
801,0802,2604,2508,73013,10025,20040,10070,900145,000
901,0102,1203,9908,19012,30023,60037,70066,600136,000
1009562,0003,7707,73011,60022,30035,60062,900128,000
1258481,7703,3406,85010,30019,80031,50055,700114,000
1507681,6103,0206,2109,30017,90028,60050,500103,000
1757061,4802,7805,7108,56016,50026,30046,50094,700
2006571,3702,5905,3207,96015,30024,40043,20088,100
2505821,2202,2904,7107,06013,60021,70038,30078,100
3005281,1002,0804,2706,40012,30019,60034,70070,800
3504861,0201,9103,9305,88011,30018,10031,90065,100
4004529451,7803,6505,47010,50016,80029,70060,600
4504248861,6703,4305,1409,89015,80027,90056,800
5004008371,5803,2404,8509,34014,90026,30053,700
5503807951,5003,0704,6108,87014,10025,00051,000
6003637591,4302,9304,4008,46013,50023,90048,600
6503477261,3702,8104,2108,11012,90022,80046,600
7003346981,3102,7004,0407,79012,40021,90044,800
7503216721,2702,6003,9007,50012,00021,10043,100
8003106491,2202,5103,7607,24011,50020,40041,600
8503006281,1802,4303,6407,01011,20019,80040,300
9002916091,1502,3603,5306,80010,80019,20039,100
9502835921,1102,2903,4306,60010,50018,60037,900
1,0002755751,0802,2303,3306,42010,20018,10036,900
1,1002615461,0302,1103,1706,1009,72017,20035,000
1,2002495219822,0203,0205,8209,27016,40033,400
1,3002394999401,9302,8905,5708,88015,70032,000
1,4002294809031,8502,7805,3508,53015,10030,800
1,5002214628701,7902,6805,1608,22014,50029,600
1,6002134468401,7302,5904,9807,94014,00028,600
1,7002064328131,6702,5004,8207,68013,60027,700
1,8002004197891,6202,4304,6707,45013,20026,900
1,9001944077661,5702,3604,5407,23012,80026,100
2,0001893957451,5302,2904,4107,03012,40025,400

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: All table entries have been rounded to three significant digits.

TABLE G2413.4(10) [402.4(26)]

SCHEDULE 40 METALLIC PIPE

GasUndiluted Propane
Inlet Pressure10.0 psi
Pressure Drop3.0 psi
Specific Gravity1.50
INTENDED USEPipe sizing between first stage (high-pressure regulator) and second stage (low-pressure regulator).
PIPE SIZE (in)
Nominal1/23/4111/411/2221/234
Actual ID0.6220.8241.0491.3801.6102.0672.4693.0684.026
Length (ft)Capacity in Thousands of Btu per Hour
105,89012,30023,20047,60071,300137,000219,000387,000789,000
204,0508,46015,90032,70049,00094,400150,000266,000543,000
303,2506,79012,80026,30039,40075,800121,000214,000436,000
402,7805,81011,00022,50033,70064,900103,000183,000373,000
502,4605,1509,71019,90029,90057,50091,600162,000330,000
602,2304,6708,79018,10027,10052,10083,000147,000299,000
702,0504,3008,09016,60024,90047,90076,400135,000275,000
801,9104,0007,53015,50023,20044,60071,100126,000256,000
901,7903,7507,06014,50021,70041,80066,700118,000240,000
1001,6903,5406,67013,70020,50039,50063,000111,000227,000
1251,5003,1405,91012,10018,20035,00055,80098,700201,000
1501,3602,8405,36011,00016,50031,70050,60089,400182,000
1751,2502,6204,93010,10015,20029,20046,50082,300167,800
2001,1602,4304,5809,41014,10027,20043,30076,500156,100
2501,0302,1604,0608,34012,50024,10038,40067,800138,400
3009351,9503,6807,56011,30021,80034,80061,500125,400
3508601,8003,3906,95010,40020,10032,00056,500115,300
4008001,6703,1506,4709,69018,70029,80052,600107,300
4507511,5702,9606,0709,09017,50027,90049,400100,700
5007091,4802,7905,7308,59016,50026,40046,60095,100
5506731,4102,6505,4508,16015,70025,00044,30090,300
6006421,3402,5305,2007,78015,00023,90042,20086,200
6506151,2902,4204,9807,45014,40022,90040,50082,500
7005911,2402,3304,7807,16013,80022,00038,90079,300
7505691,1902,2404,6006,90013,30021,20037,40076,400
8005501,1502,1704,4506,66012,80020,50036,20073,700
8505321,1102,1004,3006,45012,40019,80035,00071,400
9005161,0802,0304,1706,25012,00019,20033,90069,200
9505011,0501,9704,0506,07011,70018,60032,90067,200
1,0004871,0201,9203,9405,90011,40018,10032,00065,400
1,1004639681,8203,7405,61010,80017,20030,40062,100
1,2004429231,7403,5705,35010,30016,40029,00059,200
1,3004238841,6703,4205,1209,87015,70027,80056,700
1,4004068491,6003,2804,9209,48015,10026,70054,500
1,5003918181,5403,1604,7409,13014,60025,70052,500
1,6003787901,4903,0604,5808,82014,10024,80050,700
1,7003667651,4402,9604,4308,53013,60024,00049,000
1,8003557411,4002,8704,3008,27013,20023,30047,600
1,9003447201,3602,7804,1708,04012,80022,60046,200
2,0003357001,3202,7104,0607,82012,50022,00044,900

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: All table entries have been rounded to three significant digits.

TABLE G2413.4(11) [402.4(27)]

SCHEDULE 40 METALLIC PIPE

GasUndiluted Propane
Inlet Pressure2.0 psi
Pressure Drop1.0 psi
Specific Gravity1.50
INTENDED USEPipe sizing between 2 psig service and line pressure regulator.
PIPE SIZE (in.)
Nominal1/23/4111/411/2221/234
Actual ID0.6220.8241.0491.3801.6102.0672.4693.0684.026
Length (ft)Capacity in Thousands of Btu per Hour
102,6805,59010,50021,60032,40062,40099,500176,000359,000
201,8403,8507,24014,90022,30042,90068,400121,000247,000
301,4803,0905,82011,90017,90034,50054,90097,100198,000
401,2602,6404,98010,20015,30029,50047,00083,100170,000
501,1202,3404,4109,06013,60026,10041,70073,700150,000
601,0102,1204,0008,21012,30023,70037,70066,700136,000
709341,9503,6807,55011,30021,80034,70061,400125,000
808691,8203,4207,02010,50020,30032,30057,100116,000
908151,7003,2106,5909,88019,00030,30053,600109,000
1007701,6103,0306,2309,33018,00028,60050,600103,000
1256821,4302,6905,5208,27015,90025,40044,90091,500
1506181,2902,4405,0007,49014,40023,00040,70082,900
1755691,1902,2404,6006,89013,30021,20037,40076,300
2005291,1102,0804,2806,41012,30019,70034,80071,000
2504699811,8503,7905,68010,90017,40030,80062,900
3004258891,6703,4405,1509,92015,80027,90057,000
3503918171,5403,1604,7409,12014,50025,70052,400
4003647601,4302,9404,4108,49013,50023,90048,800
4503417141,3402,7604,1307,96012,70022,40045,800
5003226741,2702,6103,9107,52012,00021,20043,200
5503066401,2102,4803,7107,14011,40020,10041,100
6002926111,1502,3603,5406,82010,90019,20039,200
6502805851,1002,2603,3906,53010,40018,40037,500
7002695621,0602,1703,2606,2709,99017,70036,000
7502595411,0202,0903,1406,0409,63017,00034,700
8002505239852,0203,0305,8309,30016,40033,500
8502425069531,9602,9305,6409,00015,90032,400
9002354909241,9002,8405,4708,72015,40031,500
9502284768971,8402,7605,3108,47015,00030,500
1,0002224638731,7902,6805,1708,24014,60029,700
1,1002104408291,7002,5504,9107,83013,80028,200
1,2002014207911,6202,4304,6807,47013,20026,900
1,3001924027571,5502,3304,4907,15012,60025,800
1,4001853867271,4902,2404,3106,87012,10024,800
1,5001783727011,4402,1604,1506,62011,70023,900
1,6001723596771,3902,0804,0106,39011,30023,000
1,7001663486551,3402,0103,8806,18010,90022,300
1,8001613376351,3001,9503,7606,00010,60021,600
1,9001573276171,2701,9003,6505,82010,30021,000
2,0001523186001,2301,8403,5505,66010,00020,400

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: All table entries have been rounded to three significant digits.

TABLE G2413.4(12) [402.4(28)]

SCHEDULE 40 METALLIC PIPE

GasUndiluted Propane
Inlet Pressure11.0 in. w.c.
Pressure Drop0.5 in. w.c.
Specific Gravity1.50
INTENDED USEPipe sizing between single- or second-stage (low pressure) regulator and appliance.
PIPE SIZE (in.)
Nominal1/23/4111/411/2221/234
Actual ID0.6220.8241.0491.3801.6102.0672.4693.0684.026
Length (ft)Capacity in Thousands of Btu per Hour
102916081,1502,3503,5206,79010,80019,10039,000
202004187871,6202,4204,6607,43013,10026,800
301603366321,3001,9403,7505,97010,60021,500
401372875411,1101,6603,2105,1109,03018,400
501222554809851,4802,8404,5308,00016,300
601102314348921,3402,5704,1007,25014,800
801012124008211,2302,3703,7706,67013,600
100941973727631,1402,2003,5106,21012,700
125891853497161,0702,0703,2905,82011,900
150841753306771,0101,9503,1105,50011,200
175741552926008991,7302,7604,8809,950
200671402655438141,5702,5004,4209,010
250621292435007491,4402,3004,0608,290
300581202274656971,3402,1403,7807,710
350511072014126181,1901,9003,3506,840
40046971823735601,0801,7203,0406,190
45042891673445159911,5802,7905,700
50040831563204799221,4702,6005,300
55037781463004498651,3802,4404,970
60035731382834248171,3002,3004,700
65033701312694037761,2402,1904,460
70032661252573857411,1802,0904,260
75030641202463687091,1302,0004,080
80029611152363546811,0901,9203,920
85028591112273416561,0501,8503,770
90027571072203296341,0101,7903,640
95026551042133196139781,7303,530
1,00025531002063095959481,6803,420
1,1002552972003005789211,6303,320
1,2002450951952925628951,5803,230
1,3002348901852775348501,5003,070
1,4002246861762645098111,4302,930
1,5002144821692534877771,3702,800
1,2002450951952925628951,5803,230
1,3002348901852775348501,5003,070
1,4002246861762645098111,4302,930
1,5002144821692534877771,3702,800
1,6002042791622434687461,3202,690
1,7001940761562344517191,2702,590
1,8001939741512264366941,2302,500
1,9001838711462194226721,1902,420
2,0001837691422124096521,1502,350

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: All table entries have been rounded to three significant digits.

TABLE G2413.4(13) [402.4(29)]

SEMIRIGID COPPER TUBING

GasUndiluted Propane
Inlet Pressure10.0 psi
Pressure Drop1.0 psi
Specific Gravity1.50
INTENDED USESizing between first stage (high-pressure regulator) and second stage (low-pressure regulator).
TUBE SIZE (in.)
NominalK & L1/43/81/25/83/4111/411/22
ACR3/81/25/83/47/811/813/8
Outside0.3750.5000.6250.7500.8751.1251.3751.6252.125
Inside0.3050.4020.5270.6520.7450.9951.2451.4811.959
Length (ft)Capacity in Thousands of Btu per Hour
105131,0602,1503,7605,33011,40020,50032,30067,400
203527271,4802,5803,6707,83014,10022,20046,300
302835841,1902,0802,9406,29011,30017,90037,200
402425001,0201,7802,5205,3809,69015,30031,800
502154439011,5702,2304,7708,59013,50028,200
601944018161,4302,0204,3207,78012,30025,600
701793697511,3101,8603,9807,16011,30023,500
801663436991,2201,7303,7006,66010,50021,900
901563226551,1501,6303,4706,2509,85020,500
1001473046191,0801,5403,2805,9009,31019,400
1251312705499591,3602,9105,2308,25017,200
1501182444978691,2302,6304,7407,47015,600
1751092254577991,1302,4204,3606,88014,300
2001012094267441,0602,2504,0606,40013,300
250901853776599352,0003,6005,67011,800
300811683425978471,8103,2605,14010,700
350751553145497791,6603,0004,7309,840
400701442925117251,5502,7904,4009,160
450651352744806801,4502,6204,1308,590
500621272594536431,3702,4703,9008,120
550591212464306101,3002,3503,7007,710
600561152354105821,2402,2403,5307,350
650541112253935581,1902,1403,3807,040
700511062163785361,1402,0603,2506,770
750501022083645161,1001,9803,1306,520
80048992013514981,0601,9203,0206,290
85046961953404821,0301,8502,9206,090
90045931893304681,0001,8002,8405,910
95044901833204549701,7502,7505,730
1,00042881783114429441,7002,6805,580
1,10040831692964208961,6102,5405,300
1,20038791612824008551,5402,4305,050
1,30037761552703838191,4702,3204,840
1,40035731482603687871,4202,2304,650
1,50034701432503557581,3602,1504,480
1,60033681382413437321,3202,0804,330
1,70032661342343317081,2702,0104,190
1,80031641302273216871,2401,9504,060
1,90030621262203126671,2001,8903,940
2,00029601222143046481,1701,8403,830

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:

  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. All table entries have been rounded to three significant digits.

TABLE G2413.4(14) [402.4(30)]

SEMIRIGID COPPER TUBING

GasUndiluted Propane
Inlet Pressure11.0 in. w.c.
Pressure Drop0.5 in. w.c.
Specific Gravity1.50
INTENDED USESizing between single- or second-stage (low-pressure regulator) and appliance.
TUBE SIZE (in.)
NominalK & L1/43/81/25/83/4111/411/22
ACR3/81/25/83/47/811/813/8
Outside0.3750.5000.6250.7500.8751.1251.3751.6252.125
Inside0.3050.4020.5270.6520.7450.9951.2451.4811.959
Length (ft)Capacity in Thousands of Btu per Hour
1045931883294679971,8002,8305,890
2031641292263216851,2301,9504,050
3025511041822585509911,5603,250
402144891552204718481,3402,780
501939791381954177521,1802,470
601735711251773786811,0702,240
701632661151633486269882,060
801530611071523245839191,910
901428571001423045478621,800
100132754951342875178141,700
125112448841192544587221,500
150102144761082304156541,360
175NA204070992123826021,250
200NA183765921973555601,170
250NA163358821753154961,030
300NA15305274158285449936
350NA14284868146262414861
400NA13264563136244385801
450NA12244260127229361752
500NA11234056120216341710
550NA11223853114205324674
600NA10213651109196309643
650NANA203449104188296616
700NANA193347100180284592
750NANA18324596174274570
800NANA18314493168264551
850NANA17304290162256533
900NANA17294187157248517
950NANA16284085153241502
1,000NANA16273983149234488
1,100NANA15263778141223464
1,200NANA14253575135212442
1,300NANA14243472129203423
1,400NANA13233269124195407
1,500NANA13223166119188392
1,600NANA12213064115182378
1,700NANA12202962112176366
1,800NANA11202860108170355
1,900NANA11192758105166345
2,000NANA11192757102161335

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:

  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. NA means a flow of less than 10,000 Btu/hr.
  3. All table entries have been rounded to three significant digits.

TABLE G2413.4(15) [402.4(31)]

SEMIRIGID COPPER TUBING

GasUndiluted Propane
Inlet Pressure2.0 psi
Pressure Drop1.0 psi
Specific Gravity1.50
INTENDED USETube sizing between 2 psig service and line pressure regulator.
TUBE SIZE (in.)
NominalK & L1/43/81/25/83/4111/411/22
ACR3/81/25/83/47/811/813/8
Outside0.3750.5000.6250.7500.8751.1251.3751.6252.125
Inside0.3050.4020.5270.6520.7450.9951.2451.4811.959
Length (ft)Capacity in Thousands of Btu per Hour
104138521,7303,0304,3009,17016,50026,00054,200
202845851,1902,0802,9506,31011,40017,90037,300
302284709561,6702,3705,0609,12014,40029,900
401954028181,4302,0304,3307,80012,30025,600
501733567251,2701,8003,8406,92010,90022,700
601573236571,1501,6303,4806,2709,88020,600
701442976051,0601,5003,2005,7609,09018,900
801342765629831,3902,9805,3608,45017,600
901262595289221,3102,7905,0307,93016,500
1001192454988711,2402,6404,7507,49015,600
1251052174427721,1002,3404,2106,64013,800
150951974007009922,1203,8206,02012,500
175881813686449131,9503,5105,54011,500
200821683435998491,8103,2705,15010,700
250721493045317531,6102,9004,5609,510
300661352754816821,4602,6204,1408,610
350601242534426281,3402,4103,8007,920
400561162354115841,2502,2503,5407,370
450531092213865481,1702,1103,3206,920
500501032093655171,1101,9903,1406,530
55047971983464911,0501,8902,9806,210
60045931893304691,0001,8002,8405,920
65043891813164499591,7302,7205,670
70041861743044319211,6602,6205,450
75040821682934158881,6002,5205,250
80039801622834018571,5402,4305,070
85037771572743888291,4902,3504,900
90036751522653768041,4502,2804,750
95035721472583667811,4102,2204,620
1,00034711432513567601,3702,1604,490
1,10032671362383387211,3002,0504,270
1,20031641302273226881,2401,9504,070
1,30030611242173096591,1901,8703,900
1,40028591202092966331,1401,8003,740
1,50027571152012866101,1001,7303,610
1,60026551111942765891,0601,6703,480
1,70026531081882675701,0301,6203,370
1,80025511041822595531,0001,5703,270
1,90024501011772515379661,5203,170
2,0002348991722445229401,4803,090

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:

  1. Table capacities are based on Type K copper tubing inside diameter (shown), which has the smallest inside diameter of the copper tubing products.
  2. All table entries have been rounded to three significant digits.

TABLE G2413.4(16) [402.4(32)]

CORRUGATED STAINLESS STEEL TUBING (CSST)

GasUndiluted Propane
Inlet Pressure11.0 in. w.c.
Pressure Drop0.5 in. w.c.
Specific Gravity1.50
INTENDED USESizing between single or second stage (low pressure) regulator and the appliance shutoff valve.
TUBE SIZE (EHD)
Flow
Designation
1315181923253031373946486062
Length (ft)Capacity in Thousands of Btu per Hour
572991812113554267448631,4201,6382,8303,2705,7806,550
1050691291502543035216059711,1791,9902,3204,1104,640
1539551041212082484224907759721,6201,9003,3703,790
203449911061832163654256618471,4001,6502,9303,290
25304282941641923253795837621,2501,4802,6302,940
30283974871511772973445286981,1401,3502,4002,680
40233364