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// CODE SNIPPET

Section 612 (IFGC) Recirculating Direct-Fired Industrial Air Heaters

Fuel Gas Code 2018 of Kansas > 6 Specific Appliances > 612 (IFGC) Recirculating Direct-Fired Industrial Air Heaters
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612.1 General

Recirculating direct-fired industrial air heaters shall be listed to ANSI Z83.18 and shall be installed in accordance with the manufacturer's instructions.

612.2 Location

Recirculating direct-fired industrial air heaters shall be installed only in industrial and commercial occupancies. Recirculating direct-fired air heaters shall not serve any area containing sleeping quarters. Recirculating direct-fired industrial air heaters shall not be installed in hazardous locations or in buildings that contain flammable solids, liquids or gases, explosive materials or substances that can become toxic when exposed to flame or heat.

612.3 Installation

Direct-fired industrial air heaters shall be permitted to be installed in accordance with their listing and the manufacturer's instructions. Direct-fired industrial air heaters shall be installed only in industrial or commercial occupancies. Direct-fired industrial air heaters shall be permitted to provide fresh air ventilation.

612.4 Clearance From Combustible Materials

Direct-fired industrial air heaters shall be installed with a clearance from combustible material of not less than that shown on the label and in the manufacturer's instructions.

612.5 Air Supply

Air to direct-fired industrial air heaters shall be taken from the building, ducted directly from outdoors, or a combination of both. Direct-fired industrial air heaters shall incorporate a means to supply outside ventilation air to the space at a rate of not less than 4 cubic feet per minute per 1,000 Btu per hour (0.38 m3 per min per kW) of rated input of the heater. If a separate means is used to supply ventilation air, an interlock shall be provided so as to lock out the main burner operation until the mechanical means is verified. Where outside air dampers or closing louvers are used, they shall be verified to be in the open position prior to main burner operation.

612.6 Atmospheric Vents, Gas Reliefs or Bleeds

Direct-fired industrial air heaters with valve train components equipped with atmospheric vents, gas reliefs or bleeds shall have their atmospheric vent lines and gas reliefs or bleeds lead to the outdoors.
Means shall be employed on these lines to prevent water from entering and to prevent blockage by insects and foreign matter. An atmospheric vent line shall not be required to be provided on a valve train component equipped with a listed vent limiter.

612.7 Relief Opening

The design of the installation shall include adequate provision to permit direct-fired industrial air heaters to operate at rated capacity by taking into account the structure's designed infiltration rate, providing properly designed relief openings or an interlocked power exhaust system, or a combination of these methods. The structure's designed infiltration rate and the size of relief openings shall be determined by approved engineering methods. Relief openings shall be permitted to be louvers or counterbalanced gravity dampers. Where motorized dampers or closable louvers are used, they shall be verified to be in their full open position prior to main burner operation.

Related Code Sections


Section 612 Specific Appliances, (IFGC) Recirculating Direct-Fired Industrial Air Heaters
Recirculating direct-fired industrial air heaters shall be listed to ANSI Z83.18 and shall be installed in accordance with the manufacturer's ...
Fuel Gas Code 2018 of Kansas > 6 Specific Appliances > 612 (IFGC) Recirculating Direct-Fired Industrial Air Heaters
612.6 Specific Appliances, Atmospheric Vents, Gas Reliefs or Bleeds
Direct-fired industrial air heaters with valve train components equipped with atmospheric vents, gas reliefs or bleeds shall have their atmospheric ...
Fuel Gas Code 2018 of Kansas > 6 Specific Appliances > 612 (IFGC) Recirculating Direct-Fired Industrial Air Heaters > 612.6 Atmospheric Vents, Gas Reliefs or Bleeds
612.7 Specific Appliances, Relief Opening
The design of the installation shall include adequate provision to permit direct-fired industrial air heaters to operate at rated capacity by taking ...
Fuel Gas Code 2018 of Kansas > 6 Specific Appliances > 612 (IFGC) Recirculating Direct-Fired Industrial Air Heaters > 612.7 Relief Opening
611.2 Specific Appliances, Installation
Nonrecirculating direct-fired industrial air heaters shall not be used to supply any area containing sleeping quarters. Nonrecirculating direct ...
Fuel Gas Code 2018 of Kansas > 6 Specific Appliances > 611 (IFGC) Nonrecirculating Direct-Fired Industrial Air Heaters > 611.2 Installation
Section 611 Specific Appliances, (IFGC) Nonrecirculating Direct-Fired Industrial Air Heaters
Nonrecirculating direct-fired industrial air heaters shall be listed to ANSI Z83.4/CSA 3.7 and shall be installed in accordance ...
Fuel Gas Code 2018 of Kansas > 6 Specific Appliances > 611 (IFGC) Nonrecirculating Direct-Fired Industrial Air Heaters
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