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