ADOPTS WITH AMENDMENTS:

International Mechanical Code 2018 (IMC 2018)

Heads up: There are no amended sections in this chapter.

User note:

About this chapter: Chapter 9 focuses on specific types of appliances and fireplaces. It also addresses heat-rejection equipment, combustion engines, gas turbines, kilns, fuel cells, evaporative coolers, radiant heating systems and hydrogen systems.

901.1 Scope

AMENDMENT
This section has been amended at the state or city level.
This chapter shall govern the approval, design, installation, construction, alteration and repair of the appliances and equipment specifically identified herein and factory-built fireplaces. The approval, design, installation, construction, alteration and repair of gas-fired appliances shall be regulated by Appendix C..
The requirements of this chapter shall apply to the mechanical equipment and appliances regulated by this chapter, in addition to the other requirements of this code.

902.1 General

AMENDMENT
This section has been amended at the state or city level.
Masonry fireplaces shall be constructed in accordance with the Building Code.
Listed and labeled fireplace accessories shall be installed in accordance with the conditions of the listing and the manufacturer's instructions. Fireplace accessories shall comply with UL 907.
Factory-built fireplaces shall be listed and labeled and shall be installed in accordance with the conditions of the listing. Factory-built fireplaces shall be tested in accordance with UL 127.
Hearth extensions of approved factory-built fireplaces shall be installed in accordance with the listing of the fireplace. The hearth extension shall be readily distinguishable from the surrounding floor area. Listed and labeled hearth extensions shall comply with UL 1618.
An unvented gas log heater shall not be installed in a factory-built fireplace unless the fireplace system has been specifically tested, listed and labeled for such use in accordance with UL 127.
A gasketed fireplace door shall not be installed on a factory-built fireplace except where the fireplace system has been specifically tested, listed and labeled for such use in accordance with UL 127.
Pellet fuel-burning appliances shall be listed and labeled in accordance with ASTM E1509 and shall be installed in accordance with the terms of the listing.
Fireplace stoves and solid-fuel-type room heaters shall be listed and labeled and shall be installed in accordance with the conditions of the listing. Fireplace stoves shall be tested in accordance with UL 737. Solid-fuel-type room heaters shall be tested in accordance with UL 1482. Fireplace inserts intended for installation in fireplaces shall be listed and labeled in accordance with the requirements of UL 1482 and shall be installed in accordance with the manufacturer's instructions.
The connection of solid fuel appliances to chimney flues serving fireplaces shall comply with Sections 801.7 and 801.10.
Hearth extensions for fireplace stoves shall be installed in accordance with the listing of the fireplace stove. The hearth extension shall be readily distinguishable from the surrounding floor area. Listed and labeled hearth extensions shall comply with UL 1618.

906.1 General

AMENDMENT
This section has been amended at the state or city level.
Factory-built barbecue appliances shall be of an approved type and shall be installed in accordance with the manufacturer's instructions, this chapter and Chapters 3, 5, 7, 8 and Appendix C.
Incinerators and crematories shall be listed and labeled in accordance with UL 791 and shall be installed in accordance with the manufacturer's instructions.
A cooling tower used in conjunction with an air-conditioning appliance shall be installed in accordance with the manufacturer's instructions. Factory-built cooling towers shall be listed in accordance with UL 1995.
Cooling towers, evaporative condensers and fluid coolers shall be provided with ready access.

908.3 Location

AMENDMENT
This section has been amended at the state or city level.
Cooling towers, evaporative condensers and fluid coolers shall be located to prevent the discharge vapor plumes from entering occupied spaces. Plume discharges shall be not less than 5 feet (1524 mm) above or 20 feet (6096 mm) away from any ventilation inlet to a building. Location on the property shall be as required for buildings in accordance with the Building Code.

908.4 Support and Anchorage

AMENDMENT
This section has been amended at the state or city level.
Supports for cooling towers, evaporative condensers and fluid coolers shall be designed in accordance with the Building Code. Seismic restraints shall be as required by the Building Code.

908.5 Water Supply

AMENDMENT
This section has been amended at the state or city level.
Cooling towers, evaporative coolers and fluid coolers shall be provided with an approved water supply, sized for peak demand. The quality of water shall be provided in accordance with the equipment manufacturer's recommendations. The piping system and protection of the potable water supply system shall be installed as required by the Plumbing Code.
Drains, overflows and blowdown provisions shall be indirectly connected to an approved disposal location. Discharge of chemical waste shall be approved by the appropriate regulatory authority.

908.7 Refrigerants and Hazardous Fluids

AMENDMENT
This section has been amended at the state or city level.
Heat exchange equipment that contains a refrigerant and that is part of a closed refrigeration system shall comply with Chapter 11. Heat exchange equipment containing heat transfer fluids which are flammable, combustible or hazardous shall comply with the Building Code.
Cooling towers, both open circuit and closed circuit type, and evaporative condensers shall comply with Sections 908.8.1 and 908.8.2.
Cooling towers and evaporative condensers shall include controls that automate system bleed based on conductivity, fraction of metered makeup volume, metered bleed volume, recirculating pump run time or bleed time.
Cooling towers and evaporative condensers shall be equipped with drift eliminators that have a maximum drift rate of 0.005 percent of the circulated water flow rate as established in the equipment's design specifications.
Vented wall furnaces shall be installed in accordance with their listing and the manufacturer's instructions. Oil-fired furnaces shall be tested in accordance with UL 730.
Vented wall furnaces shall be located so as not to cause a fire hazard to walls, floors, combustible furnishings or doors. Vented wall furnaces installed between bathrooms and adjoining rooms shall not circulate air from bathrooms to other parts of the building.
Vented wall furnaces shall be located so that a door cannot swing within 12 inches (305 mm) of an air inlet or air outlet of such furnace measured at right angles to the opening. Doorstops or door closers shall not be installed to obtain this clearance.
Ducts shall not be attached to wall furnaces. Casing extension boots shall not be installed unless listed as part of the appliance.
A manual shutoff valve shall be installed ahead of all controls.
Vented wall furnaces shall be provided with access for cleaning of heating surfaces, removal of burners, replacement of sections, motors, controls, filters and other working parts, and for adjustments and lubrication of parts requiring such attention. Panels, grilles and access doors that must be removed for normal servicing operations shall not be attached to the building construction.
Floor furnaces shall be installed in accordance with their listing and the manufacturer's instructions. Oil-fired furnaces shall be tested in accordance with UL 729.

Floor furnaces shall not be installed in the floor of any aisle or passageway of any auditorium, public hall, place of assembly, or in any egress element from any such room or space.

With the exception of wall register models, a floor furnace shall not be placed closer than 6 inches (152 mm) to the nearest wall, and wall register models shall not be placed closer than 6 inches (152 mm) to a corner.

The furnace shall be placed such that a drapery or similar combustible object will not be nearer than 12 inches (305 mm) to any portion of the register of the furnace. Floor furnaces shall not be installed in concrete floor construction built on grade. The controlling thermostat for a floor furnace shall be located within the same room or space as the floor furnace or shall be located in an adjacent room or space that is permanently open to the room or space containing the floor furnace.

910.3 Bracing

AMENDMENT
This section has been amended at the state or city level.
The floor around the furnace shall be braced and headed with a support framework design in accordance with the Building Code.
The lowest portion of the floor furnace shall have not less than a 6-inch (152 mm) clearance from the grade level; except where the lower 6-inch (152 mm) portion of the floor furnace is sealed by the manufacturer to prevent entrance of water, the minimum clearance shall be reduced to not less than 2 inches (51 mm). Where these clearances are not present, the ground below and to the sides shall be excavated to form a pit under the furnace so that the required clearance is provided beneath the lowest portion of the furnace. A 12-inch (305 mm) minimum clearance shall be provided on all sides except the control side, which shall have an 18-inch (457 mm) minimum clearance.
Duct furnaces shall be installed in accordance with the manufacturer's instructions. Electric duct furnaces shall comply with UL 1996.
Electric infrared radiant heaters shall comply with UL 499.
Infrared radiant heaters shall be fixed in a position independent of fuel and electric supply lines. Hangers and brackets shall be noncombustible material.
Heaters shall be installed with clearances from combustible material in accordance with the manufacturer's installation instructions.
Clothes dryers shall be installed in accordance with the manufacturer's instructions. Electric residential clothes dryers shall be tested in accordance with UL 2158. Electric coin-operated clothes dryers shall be tested in accordance with UL 2158. Electric commercial clothes dryers shall be tested in accordance with UL 1240.
Clothes dryers shall be exhausted in accordance with Section 504.
Clothes dryers shall be installed with clearance to combustibles in accordance with the manufacturer's instructions.
Sauna heaters shall be located so as to minimize the possibility of accidental contact by a person in the room.
Sauna heaters shall be protected from accidental contact by an approved guard or barrier of material having a low coefficient of thermal conductivity. The guard shall not substantially affect the transfer of heat from the heater to the room.
Sauna heaters shall be listed and labeled in accordance with UL 875 and shall be installed in accordance with their listing and the manufacturer's instructions.
Panels, grilles and access doors that are required to be removed for normal servicing operations shall not be attached to the building.
Sauna heaters shall be equipped with a thermostat that will limit room temperature to 194°F (90°C). If the thermostat is not an integral part of the sauna heater, the heat-sensing element shall be located within 6 inches (152 mm) of the ceiling. If the heat-sensing element is a capillary tube and bulb, the assembly shall be attached to the wall or other support, and shall be protected against physical damage.
A timer, if provided to control main burner operation, shall have a maximum operating time of 1 hour. The control for the timer shall be located outside the sauna room.
A ventilation opening into the sauna room shall be provided. The opening shall be not less than 4 inches by 8 inches (102 mm by 203 mm) located near the top of the door into the sauna room.

The following permanent notice, constructed of approved material, shall be mechanically attached to the sauna room on the outside:

WARNING: DO NOT EXCEED 30 MINUTES IN
SAUNA. EXCESSIVE EXPOSURE CAN BE HARM-
FUL TO HEALTH. ANY PERSON WITH POOR
HEALTH SHOULD CONSULT A PHYSICIAN
BEFORE USING SAUNA.

The words shall contrast with the background and the wording shall be in letters not less than 1/4-inch (6.4 mm) high.

Exception: This section shall not apply to one- and two-family dwellings.

The installation of liquid-fueled stationary internal combustion engines and gas turbines, including exhaust, fuel storage and piping, shall meet the requirements of NFPA 37. Stationary engine generator assemblies shall meet the requirements of UL 2200.
Permanently installed equipment and appliances powered by internal combustion engines and turbines shall be installed in accordance with the manufacturer's instructions and NFPA 37.

916.1 General

AMENDMENT
This section has been amended at the state or city level.

Pool and spa heaters shall be installed in accordance with the manufacturer's instructions. Oil-fired pool and spa heaters shall be tested in accordance with UL 726. Electric pool and spa heaters shall be tested in accordance with UL 1261. Pool and spa heat pump water heaters shall comply with UL 1995 or CSA C22.2 No. 236.

Exception: Portable residential spas and portable residential exercise spas shall comply with UL 1563 or CSA C22.2 No. 218.1.

Cooking appliances that are designed for permanent installation, including ranges, ovens, stoves, broilers, grills, fryers, griddles and barbecues, shall be listed, labeled and installed in accordance with the manufacturer's instructions. Commercial electric cooking appliances shall be listed and labeled in accordance with UL 197. Household electric ranges shall be listed and labeled in accordance with UL 858. Microwave cooking appliances shall be listed and labeled in accordance with UL 923. Oil-burning stoves shall be listed and labeled in accordance with UL 896. Solid-fuel-fired ovens shall be listed and labeled in accordance with UL 2162.
Cooking appliances installed within dwelling units and within areas where domestic cooking operations occur shall be listed and labeled as household-type appliances for domestic use.
Oil-fired furnaces shall be tested in accordance with UL 727. Electric furnaces shall be tested in accordance with UL 1995. Solid fuel furnaces shall be tested in accordance with UL 391. Forced-air furnaces shall be installed in accordance with the listings and the manufacturer's instructions.
Electric heat pumps shall be tested in accordance with UL 1995.
Volume dampers shall not be placed in the air inlet to a furnace in a manner that will reduce the required air to the furnace.
Circulating air for fuel-burning, forced-air-type, warm-air furnaces shall be conducted into the blower housing from outside the furnace enclosure by continuous air-tight ducts.
Outdoor intake openings shall be located in accordance with Section 401.4. Return air openings shall be located in accordance with Section 601.5.
Outdoor air intake openings shall be protected in accordance with Section 401.5.
The installation of conversion burners shall conform to ANSI Z21.8.
Unit heaters shall be installed in accordance with the listing and the manufacturer's instructions. Oil-fired unit heaters shall be tested in accordance with UL 731.
Suspended-type unit heaters shall be supported by elements that are designed and constructed to accommodate the weight and dynamic loads. Hangers and brackets shall be of noncombustible material. Suspended-type oil-fired unit heaters shall be installed in accordance with NFPA 31.
A unit heater shall not be attached to a warm-air duct system unless listed for such installation.
Vented room heaters shall be listed and labeled and shall be installed in accordance with the conditions of the listing and the manufacturer's instructions.
Kerosene and oil-fired stoves shall be listed and labeled and shall be installed in accordance with the conditions of the listing and the manufacturer's instructions. Kerosene and oil-fired stoves shall comply with NFPA 31 and UL 896.

923.1 General

AMENDMENT
This section has been amended at the state or city level.
Kilns shall be listed and labeled unless otherwise approved in accordance with Section 105.2. The approval of unlisted appliances in accordance with Section 105.2 shall be based on approved engineering evaluation. The provisions of this section shall apply to listed and unlisted kilns that are used for ceramics, have a maximum interior volume of 20 cubic feet (0.566 m3) and are used for hobby and noncommercial purposes.

923.1.1 Installation

AMENDMENT
This section has been amended at the state or city level.
Kilns shall be installed in accordance with the manufacturer's instructions and the provisions of this code. Electric kilns shall comply with UL 499.

923.2 Unlisted Outdoor Kiln Installation

AMENDMENT
This section has been amended at the state or city level.
Unlisted kilns shall be installed only outdoors in accordance with the manufacturer's installation instructions and Sections 923.2.1 through 923.2.1.5.1.

923.2.1 Installations Under Structures

AMENDMENT
This section has been amended at the state or city level.
Kilns shall be installed with minimum clearances as specified in Section 923.2.1.1. Kilns located under a roof and enclosed by two or more vertical wall surfaces shall have a hood and gravity ventilation duct installed to comply with Sections 923.2.1.3 and 923.2.1.4.

923.2.1.1 Clearances for Interior Installation

AMENDMENT
This section has been amended at the state or city level.
The sides and tops of kilns shall be located a minimum of 18 inches (457 mm) from any noncombustible surface and 3 feet (914 mm) from any combustible wall surface. Kilns shall be installed on noncombustible flooring, consisting of at least 2 inches (51 mm) of solid masonry or concrete extending at least 12 inches (305 mm) beyond the base or supporting members of the kiln.

Exception: These clearances may be reduced, provided independent testing is provided to and approved by the building official.

923.2.1.2 Control Side Clearance

AMENDMENT
This section has been amended at the state or city level.
The clearance on the control side of a kiln shall not be reduced to less than 30 inches (762 mm).

923.2.1.3 Hoods

AMENDMENT
This section has been amended at the state or city level.
Where required, a canopy type hood shall be installed directly above each kiln. The face opening area of the hood shall be equal to or greater than the top horizontal surface area of the kiln. The hood shall be constructed of not less than 0.030-inch (0.76 mm) (No. 22 U.S. gage) galvanized steel or equivalent and be supported at a height of between 12 inches and 30 inches (305 mm and 762 mm) above the kiln by noncombustible supports.

Exception: Electric kilns installed with listed exhaust blowers may be used when marked as being suitable for the kiln and installed in accordance with manufacturer's instructions.

923.2.1.4 Gravity Ventilation Ducts

AMENDMENT
This section has been amended at the state or city level.
Each kiln hood shall be connected to a gravity ventilation duct extending in a vertical direction to outside the building. This duct shall be of the same construction as the hood and shall have a cross-sectional area of not less than one-fifteenth of the face opening of the hood. The duct shall terminate a minimum of 12 inches (305 mm) above any portion of a building within 4 feet (1219 mm) and terminate no less than 4 feet (1219 mm) from any openable windows or other opening into the building or adjacent property line. The duct to the outside shall be shielded, without reduction of duct area, to prevent entrance of rain into the duct. The duct shall be supported at each section by noncombustible supports.

923.2.1.5 Hood and Duct Clearances

AMENDMENT
This section has been amended at the state or city level.
Every hood and duct serving a fuel-burning kiln shall have a clearance from combustible construction of at least 18 inches (457 mm). This clearance may be reduced in accordance with Table 308.4.2.

923.2.1.5.1 Makeup Air

AMENDMENT
This section has been amended at the state or city level.
Provisions shall be made for makeup air to enter the enclosure in which a kiln is installed at a rate at least equal to the air being removed through the kiln hood.

924.1 General

AMENDMENT
This section has been amended at the state or city level.
Stationary fuel cell power systems having a power output not exceeding 10 MW shall be tested in accordance with ANSI/CSA America FC 1 and shall be installed in accordance with the manufacturer's instructions, NFPA 853 and the Building Code.

925.1 General

AMENDMENT
This section has been amended at the state or city level.
Masonry heaters shall be constructed in accordance with the Building Code.

926.1 Installation

AMENDMENT
This section has been amended at the state or city level.
The installation of gaseous hydrogen systems shall be in accordance with the applicable requirements of this code and the Building Code.

Section 927 Radiant Heating Systems

AMENDMENT
This section has been amended at the state or city level.

927.1 General

AMENDMENT
This section has been amended at the state or city level.

927.2 Clearances

AMENDMENT
This section has been amended at the state or city level.

927.3 Installation on Wood or Steel Framing

AMENDMENT
This section has been amended at the state or city level.

927.4 Installation in Concrete or Masonry

AMENDMENT
This section has been amended at the state or city level.

927.5 Finish Surfaces

AMENDMENT
This section has been amended at the state or city level.

Section 928 927 Evaporative Cooling Equipment

AMENDMENT
This section has been amended at the state or city level.

928.1 927.1 General

AMENDMENT
This section has been amended at the state or city level.

Evaporative cooling equipment shall:

  1. Be installed in accordance with the manufacturer's instructions.
  2. Be installed on level platforms in accordance with Section 304.10.
  3. Have openings in exterior walls or roofs flashed in accordance with the Building Code.
  4. Be provided with an approved water supply, sized for peak demand. The quality of water shall be provided in accordance with the equipment manufacturer's recommendations. The piping system and protection of the potable water supply system shall be installed as required by the Plumbing Code.
  5. Have air intake opening locations in accordance with Section 401.4.

Section 929 928 High-Volume Large-Diameter Fans

AMENDMENT
This section has been amended at the state or city level.

929.1 928.1 General

AMENDMENT
This section has been amended at the state or city level.
Where provided, high-volume large-diameter fans shall be tested and labeled in accordance with AMCA 230, listed and labeled in accordance with UL 507, and installed in accordance with the manufacturer's instructions.

Section 929 Solid Fuel-Burning Devices

AMENDMENT
This section has been amended at the state or city level.

929.1 Used Solid Fuel-Burning Stoves

AMENDMENT
This section has been amended at the state or city level.
For reference only: Not adopted as part of the state building code.

Solid fuel-burning devices, as defined by the Oregon Department of Environmental Quality, OAR 340-262-0500, are required by DEQ to bear a certification label.

929.2 Labeling for Identification

AMENDMENT
This section has been amended at the state or city level.
For reference only: Not adopted as part of the state building code.

The Oregon Department of Environmental Quality regulates the sale and use of residential and commercial solid fuel-burning devices. See Oregon Administrative Rule (OAR) Chapter 340, Division 262. DEQ prohibits the installation of "used solid fuel-burning devices."

Exceptions:
  1. Solid fuel-burning devices certified as new on or after July 1, 1986, under rules adopted pursuant to OAR 340-262-0500.
  2. Antique wood stoves pursuant to OAR 340-262-0700.
  3. Pellet stoves under rules adopted pursuant to OAR 340-262-0450.
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