What is “Effective Area” or “Ak” in the engineering tables ?

AK Engineering tables
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What is “Effective Area” or “Ak” in the engineering tables ?

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Effective area, Ak, is the net area (in square feet) of a grille utilized by the area stream in passing through the face openings. It is used in the equation: CFM= Face Velocity* Effective Area. This is used in our engineering data tables.

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