What is the airflow through a 2 ft by 3 ft hole if the air velocity is 100 ft per minute?
A) 100 CFM B) 2 × 3 = 6 sq feet; 6 × 100 FPM = 600 CFM
C) 2 + 3 = 5 sq feet; 5 × 100 FPM = 500 CFM D) 2 × 3 = 6 sq feet; 100 FPM/6 = 17 CFM
B
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