Gas Fitter Practice · Question
A gas appliance with an input of 100,000 BTU/hr requires how much combustion air for proper operation (approximately)?
A common rule of thumb is 10 cubic feet per minute (CFM) of combustion air per 10,000 BTU/hr, so 100,000 BTU/hr requires roughly 100 CFM.
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Question: A gas appliance with an input of 100,000 BTU/hr requires how much combustion air for proper operation (approximately)?
Answer options:
- 10 CFM
- 50 CFM ✅ 100 CFM
- 200 CFM
Correct answer: 100 CFM
Explanation: A common rule of thumb is 10 cubic feet per minute (CFM) of combustion air per 10,000 BTU/hr, so 100,000 BTU/hr requires roughly 100 CFM.
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