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) 115,000 / 1,000 = 115 square inches free area each
B) 115,000 / 2,000 = 57.5 square inches free area each
C) 115,000 / 4,000 = 28.75 square inches free area each
D) The size is irrelevant so long as there are combustion air vents


C

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