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) 100,000/1,000 = 100 sq in for each grille B) 100,000/4,000 = 25 sq in for each grille
C) 100,000/5,000 = 20 sq in for each grille D) 100,000/2,000 = 50 sq in for each grille
C
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