What is the CFM of air moving through an 8 inch x 10 inch duct if the air velocity is 800 FPM?
A) 800 CFM
B) 8 × 10 = 80 sq inches, 80/144 = 0.56 sq feet, 800 / 0.56 = 1428 CFM
C) 8 × 10 = 80 sq inches, 800 / 80 = 10 CFM
D) 8 × 10 = 80 sq inches, 80/144 = 0.56 sq feet, 800 × 0.56 = 444 CFM
D
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