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Duct Size
Calculation

Calculate rectangular and circular duct sizes by entering airflow and duct velocity.

Duct Parameters

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Result

Calculation result will appear here

helpHow to Use?

Enter the total airflow, duct air velocity and one side of the duct. The other side and circular duct diameter are calculated automatically.

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Engineering Note

Duct sizing calculations follow ASHRAE/EUROVENT standards. Contact our technical team for bespoke projects and duct selection support.