What size should the combustion air openings be for a room with an 80,000 BTU/hr input furnace and a 35,000 BTU/hr water heater if the openings are opening directly into a ventilated attic and a ventilated crawlspace?
A) The size is irrelevant so long as there are combustion air vents.
B) 115,000/1,000 = 115 sq in free area each
C) 115,000/2,000 = 57.5 sq in free area each
D) 115,000/4,000 = 28.75 sq in free area each
D
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