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Per the National Fuel Gas Code (NFPA 54), a space is considered a 'confined space' for combustion-air purposes when its volume is less than:

10 cubic feet per 1,000 Btu/h of appliance input 25 cubic feet per 1,000 Btu/h of appliance input 50 cubic feet per 1,000 Btu/h of appliance input 100 cubic feet per 1,000 Btu/h of appliance input

Correct Answer:

50 cubic feet per 1,000 Btu/h of appliance input

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