In a duct which measures 18 x 12 inside, the velocity is 1500 FPM. What is the CFM being handled by the duct?

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Worker in a carpentry shop measures plywood for cutting

Apartment Fusebox Installation by Caucasian Electrician in His 40s. Residential Home Electric System Theme.

Joyful young man construction worker holding mobile phone and smiling while standing by the table with laptop