Are combustion air ducts needed for large basements?
- His basement measures 30′ x 25′, and he has 7′ ceilings, which equals 5,250 cubic feet of indoor space, and that’s assuming it’s all one big open space, or at least a space that all freely communicates; no doors separating rooms. . To put this into context, let’s say that Bob has an 80,000 BTU boiler and a 40,000 BTU water heater. Pretty typical sizes. 5 says, in so many words, that 50 cubic feet of indoor space is needed for every 1,000 BTUs of combustion. Section 304. The total BTUs is 120k. He needs at least 120 x 50 cubic feet of basement space, or 6,000 cubic feet, to possibly not need a dedicated combustion air duct
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