A rectangular supply duct is 24 in. by 12 in. inside and carries air at 800 fpm. What airflow is carried by that duct?
Correct Answer
C) 1,600 cfm
Duct area is 24 in. x 12 in. = 2 ft x 1 ft = 2 sf. Airflow is area x velocity = 2 x 800 = 1,600 cfm. Other choices use one duct dimension, multiply by inches, or double the area.
Why This Is the Correct Answer
Duct area is 24 in. x 12 in. = 2 ft x 1 ft = 2 sf. Airflow is area x velocity = 2 x 800 = 1,600 cfm. Other choices use one duct dimension, multiply by inches, or double the area.
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