Application & Flow
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Sizing Results
Required Face Area
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ft²
Required Area
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in²
Recommended Size
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inches
Actual Face Velocity
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FPM
Standard Grille Sizes — CFM Capacity at Various Face Velocities
| Size (W×H in) | Net Area (ft²) | CFM @ 400 FPM | CFM @ 500 FPM | CFM @ 600 FPM | CFM @ 750 FPM | Your CFM |
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Net free area is approximately 70% of gross face area for typical bar grilles. Ceiling diffusers vary by manufacturer — consult product data for Ak factor. Face velocity above 600 FPM may cause noise in occupied spaces (NC > 35).