The volume required for combustion air obtained from indoors is determined by using which method?

The volume required for combustion air obtained from indoors is determined by using which method?

• A. Standard Method
• B. KAIR Method
• C. ASHRAE Method
• D. B and C apply

Answer: (D)

When determining the amount of combustion air that must come from indoors, you have more than one accepted calculation approach. Two of these are the KAIR method and the ASHRAE method, and both are designed to establish the indoor air volume needed to support combustion without pulling air from outdoors. The KAIR method provides a straightforward, space- and appliance-based calculation that ties the appliance’s input rating to the room or zone air requirement. The ASHRAE method uses guidance from ASHRAE standards on ventilation and indoor air quality to determine the needed air volume, incorporating broader ventilation considerations. Because both methods are recognized for this purpose, either can be used depending on the installation and applicable code provisions. The Standard Method isn’t the approach selected here, so the correct choice reflects that both KAIR and ASHRAE apply.

When determining the amount of combustion air that must come from indoors, you have more than one accepted calculation approach. Two of these are the KAIR method and the ASHRAE method, and both are designed to establish the indoor air volume needed to support combustion without pulling air from outdoors. The KAIR method provides a straightforward, space- and appliance-based calculation that ties the appliance’s input rating to the room or zone air requirement. The ASHRAE method uses guidance from ASHRAE standards on ventilation and indoor air quality to determine the needed air volume, incorporating broader ventilation considerations. Because both methods are recognized for this purpose, either can be used depending on the installation and applicable code provisions. The Standard Method isn’t the approach selected here, so the correct choice reflects that both KAIR and ASHRAE apply.