Is This Calculation Correct

Is this calculation correct?

calculations for air

velocity, diameter information

8 inches in a foot or 16 inches in feet squared or .6666 squared = .4444 inches

12 inches in a foot = 1 feet squared

Volumetric flow rate (cfm) = velocity of the air (fpm)*cross-sectional area of duct (sf)

683 fpm*.4444 sf = flow rate =303.56 cfm

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