How we can find out duct area from CFM?

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How we can find out duct area from CFM?..

CFM DIVIDED BY VELOCITY MULITIPLY BY 144 AND DIVIDED BY
DUCT HEIGHT.

FOR EXAMPLE CFM IS 1000
VFM IS 1200

1000/1200*144= 119 / DUCT HEIGHT IS 14 INCHES
119 / 14 = 8.5 IS DUCT WIDTH.

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