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// CODE SNIPPET

914.0 Non-Recirculating Direct Gas-Fired Industrial Air Heaters

Uniform Mechanical Code 2018 of Nevada > 9 Installation of Specific Appliances > 914.0 Non-Recirculating Direct Gas-Fired Industrial Air Heaters
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914.1 Application

Direct gas-fired industrial air heaters of the non-recirculating type shall be listed in accordance with CSA Z83.4. [NFPA 54:10.8.1]

914.2 Prohibited Installations

Non-recirculating direct gas-fired industrial air heaters shall not serve any area containing sleeping quarters. Non-recirculating direct gas-fired industrial air heaters shall not recirculate room air. [NFPA 54:10.8.2.1, 10.8.2.2]

914.3 Installation

Non-recirculating direct gas-fired industrial air heaters shall be installed in accordance with the manufacturer's instructions. [NFPA 54:10.8.3.1]

914.3.1 Industrial or Commercial Occupancies

Non-recirculating direct gas-fired industrial air heaters shall be installed only in industrial or commercial occupancies. [NFPA 54:10.8.3.2]

914.3.2 Fresh Air Ventilation

Non-recirculating direct gas-fired industrial air heaters shall be permitted to provide fresh air ventilation. [NFPA 54:10.8.3.3]

914.3.3 Access Required

Non-recirculating direct gas-fired industrial air heaters shall be provided with access for removal of burners; for replacement of motors, controls, filters, and other working parts; and for adjustment and lubrication of parts requiring maintenance. [NFPA 54:10.8.3.4]

914.4 Clearance From Combustible Materials

Non-recirculating direct gas-fired industrial air heaters shall be installed with a clearance from combustible materials of not less than that shown on the rating plate and the manufacturer's installation instructions. [NFPA 54:10.8.4]

914.5 Air Supply

All air to the non-recirculating direct gas-fired industrial air heater shall be ducted directly from outdoors. Where outdoor air dampers or closing louvers are used, they shall be verified to be in the open position prior to main burner operation. [NFPA 54:10.8.5]

914.6 Atmospheric Vents, Gas Reliefs, or Bleeds

Non-recirculating direct gas-fired industrial air heaters with valve train components equipped with atmospheric vents, gas reliefs, or bleeds shall have their vent lines, gas reliefs, or bleeds lead to a safe point outdoors. Means shall be employed on these lines to prevent water from entering and to prevent blockage from 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. [NFPA 54:10.8.6]

914.7 Relief Openings

The design of the installation shall include adequate provisions to permit the non-recirculating direct gas-fired industrial air heater to operate at its rated airflow without overpressurizing the space served by the heater by taking into account the structure's designed infiltration rate, properly designed relief openings, or an interlocked powered exhaust system, or a combination of these methods. [NFPA 54:10.8.7]

914.7.1 Infiltration Rate

The structure's designed infiltration rate and the size of relief opening(s) shall be determined by approved engineering methods. [NFPA 54:10.8.7.1]

914.7.2 Louver or Gravity Dampers

Louver or counterbalanced gravity damper relief openings shall be permitted. Where motorized dampers or closeable louvers are used, they shall be proved to be in their open position prior to main burner operation. [NFPA 54:10.8.7.2]

914.8 Purging

Inlet ducting, where used, shall be purged with not less than four air changes prior to an ignition attempt. [NFPA 54:10.8.8]

Related Code Sections


914.0 Installation of Specific Appliances, Non-Recirculating Direct Gas-Fired Industrial Air Heaters
Direct gas-fired industrial air heaters of the non-recirculating type shall be listed in accordance with CSA Z83.4. [NFPA 54:10.8.1 ...
Uniform Mechanical Code 2018 of Nevada > 9 Installation of Specific Appliances > 914.0 Non-Recirculating Direct Gas-Fired Industrial Air Heaters
914.6 Installation of Specific Appliances, Atmospheric Vents, Gas Reliefs, or Bleeds
Non-recirculating direct gas-fired industrial air heaters with valve train components equipped with atmospheric vents, gas reliefs, or bleeds shall ...
Uniform Mechanical Code 2018 of Nevada > 9 Installation of Specific Appliances > 914.0 Non-Recirculating Direct Gas-Fired Industrial Air Heaters > 914.6 Atmospheric Vents, Gas Reliefs, or Bleeds
914.7 Installation of Specific Appliances, Relief Openings
The design of the installation shall include adequate provisions to permit the non-recirculating direct gas-fired industrial air heater to operate ...
Uniform Mechanical Code 2018 of Nevada > 9 Installation of Specific Appliances > 914.0 Non-Recirculating Direct Gas-Fired Industrial Air Heaters > 914.7 Relief Openings
914.8 Installation of Specific Appliances, Purging
Inlet ducting, where used, shall be purged with not less than four air changes prior to an ignition attempt. [NFPA 54:10.8.8] ...
Uniform Mechanical Code 2018 of Nevada > 9 Installation of Specific Appliances > 914.0 Non-Recirculating Direct Gas-Fired Industrial Air Heaters > 914.8 Purging
914.3.1 Installation of Specific Appliances, Industrial or Commercial Occupancies
Non-recirculating direct gas-fired industrial air heaters shall be installed only in industrial or commercial occupancies. [NFPA 54:10.8.3.2] ...
Uniform Mechanical Code 2018 of Nevada > 9 Installation of Specific Appliances > 914.0 Non-Recirculating Direct Gas-Fired Industrial Air Heaters > 914.3 Installation > 914.3.1 Industrial or Commercial Occupancies
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