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Combustion appliances require 50 cubic feet per 1000 BTU per hour (BTU/h) aggregate input.
As a rule of thumb, 1 ft3 of natural gas theoretically requires 10 ft3 of air for complete combustion at 60F and 14.7 psi under perfect conditions.
Where all combustion air and dilution air is provided by a mechanical forced-air system, the combustion air and dilution air shall be supplied at the minimum rate of 1 cfm per 2,400 Btu/h [0.00067 m3/(s kW)] of combined input rating of all the fuel-burning appliances served.
There are two ways to determine the amount of indoor combustion air required from indoors. One is the Standard Method (G2407. 5.1) (304.5. 1) calculated by a ratio of 50 cubic feet per 1,000 Btu/h (4.8 m3/Kw) of the appliance input rating.
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