When installing an oil fired furnace in a confined space with a firing rate of 100,000 Btuh, what is the minimum free air opening required if the combustion air vents are directly communicating with the outside?
A) 100,000 / 2,000 = 50 square inches for each grille
B) 100,000 / 5,000 = 20 square inches for each grille
C) 100,000 / 1,000 = 100 square inches for each grille
D) 100,000 / 4,000 = 25 square inches for each grille
B
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