2.0203.1 Combustion Air for Natural Draft Appliances

Topic: 
Combustion Safety
Subtopic: 
Vented Gas Appliances
Desired Outcome: 
Sufficient air provided in the Combustion Appliance Zone ( CAZ CAZ Combustion appliance zone )
TitleSpecification(s)Objective(s)
2.0203.1a
Required combustion air

The required volume of indoor air will be determined in accordance with IRC IRC International Residential Code and authority having jurisdiction, except that where the air infiltration Infiltration The uncontrolled passage of outside air into a building through unintended leaks in the building envelope rate is known to be less than 0.40 air changes per hour (ACH), IRC IRC International Residential Code will be used

Exception: Existing appliances that have passed combustion safety testing per BPI BPI Building Performance Institute, www.bpi.org 1200 are deemed to have sufficient combustion air

Determine if existing conditions meet the combustion air calculation

2.0203.1b
Additional combustion air (if action is required)

Additional combustion air will be provided in accordance with IRC IRC International Residential Code and authority having jurisdiction when necessary to solve spillage problems 

Ensure adequate combustion air for operation of the appliance

2.0203.1c
Spillage testing

If spillage in a combustion appliance with a warm vent exceeds two minutes during pressure testing, specify measures to mitigate

If spillage in a combustion appliance with a cold vent exceeds five minutes during pressure testing, specify measures to mitigate

Detect excessive spillage of combustion gases

TitleSpecification(s)Objective(s)
2.0203.1a
Required combustion air

The required volume of indoor air will be determined in accordance with IRC IRC International Residential Code and authority having jurisdiction, except that where the air infiltration Infiltration The uncontrolled passage of outside air into a building through unintended leaks in the building envelope rate is known to be less than 0.40 air changes per hour (ACH), IRC IRC International Residential Code will be used

Exception: Existing appliances that have passed combustion safety testing per BPI BPI Building Performance Institute, www.bpi.org 1200 are deemed to have sufficient combustion air

Determine if existing conditions meet the combustion air calculation

2.0203.1b
Additional combustion air (if action is required)

Additional combustion air will be provided in accordance with IRC IRC International Residential Code and authority having jurisdiction when necessary to solve spillage problems 

Ensure adequate combustion air for operation of the appliance

2.0203.1c
Spillage testing

If spillage in a combustion appliance with a warm vent exceeds two minutes during pressure testing, specify measures to mitigate

If spillage in a combustion appliance with a cold vent exceeds five minutes during pressure testing, specify measures to mitigate

Detect excessive spillage of combustion gases