An inspector is checking the combustion air supply for a gas furnace. Which of the following is a requirement for the combustion air supply, according to the 2024 IRC?
- A minimum of 100 cubic feet per hour of air for each 10,000 Btu input
- BA minimum of 150 cubic feet per hour of air for each 10,000 Btu input
- CA minimum of 200 cubic feet per hour of air for each 10,000 Btu input
- DA minimum of 250 cubic feet per hour of air for each 10,000 Btu input
Exam tip
Use the correct calculation for determining the required combustion air supply as per the code.
Why A is correct
The 2024 IRC requires a minimum of 100 cubic feet per hour of air for each 10,000 Btu input for the combustion air supply to ensure adequate air for combustion.