Combustion Air - Fuel-Fired Appliances

Detail ID 5.0502.1
Topic
Combustion Safety
Subtopic
Combustion Air
Desired Outcome

Sufficient combustion air provided to appliances

SF Single Family Site-Built Housing
MH Manufactured Housing
MF Multifamily Housing

Specifications

  • SF
  • MF
Specification Objective

Calculate combustion air needs in conformance with the applicable code (i.e., NFPA 54, IFGC, or NFPA 31) and manufacturer requirements

In instances where conflicts occur between the code and the manufacturer's installation instructions, the more restrictive provisions shall apply (i.e., more air rather than less)

The minimum required volume is 50 cubic feet per 1,000 BTU/h, except that where the air infiltration rate is known to be less than 0.40 air changes per hour (ACH), then use alternate calculation from IFGC

Compliant and safe amount of combustion air for appliance

  • SF
  • MF
Specification Objective

Provide combustion air in conformance with the applicable code (i.e., NFPA 54, IFGC, or NFPA 31) and manufacturer specifications

In instances where conflicts occur between the code and the manufacturer's installation instructions, the more restrictive provisions shall apply (i.e., more air rather than less)

Compliant combustion air supply

  • MH
Specification Objective

Separate all fuel-burning appliances (except ranges, ovens, illuminating appliances, clothes dryers, solid fuel-burning fireplaces, and solid fuel-burning fireplace stoves) from the interior atmosphere of the manufactured home with only combustion air inlets and flue gas outlets that are listed or certified as components of the appliance

Compliant and safe amount of combustion air for appliance

  • MH
Specification Objective

The required separation may be obtained by:

(1) Installing direct vent, sealed combustion appliances; or

(2) Installing appliance enclosures that separate the appliance combustion system and venting system from the interior atmosphere of the manufactured home with no door, removable access panel, or other opening into the enclosure from the inside of the manufactured home and sealing any opening for ducts, piping, wiring, etc.

Compliant combustion air supply

View Sub-Topic:
Combustion Air