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HomeConstructionDuct Size Calculator

Construction

DuctSizeCalculator

Free online duct size calc calculator. Enter cfm and velocity to get area. Formula: area = cfm ÷ velocity.

Duct Size Calc

CFM

CFM is required

Velocity

Velocity is required

Enter the values above to see your result.

Duct cross-section area.

Formula

area = cfm ÷ velocity

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