What size should the combustion air ducts be for a room with an 60,000 BTU/hr input furnace and a 16,000 BTU/hr water heater if the air is traveling through horizontal ducts?
A) 76,000 / 1,000 = 76 square inches free area each
B) 76,000 / 4,000 = 19 square inches free area each
C) 76,000 / 2,000 = 38 square inches free area each
D) The size is irrelevant so long as there are combustion air vents
B
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