Combustion air for gas appliances should be:
A) 10 cu ft of combustion air per 1,000 BTU of firing rate.
B) Recycled by piping the vent gases back into the combustion air intake.
C) 1 cu ft of combustion air for every cubic foot of gas.
D) 14 to 15 cu ft of combustion air per 1,000 BTU of firing rate.
D
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