Diffuser Grille Sizing: perforated_ceiling
Supply diffuser and return grille performance data — CFM range, throw distance to 50 fpm, NC ratings, face velocity, and static pressure drop by diffuser type and neck size
| diffuser type | neck size in | NC rating (NC) | cfm max (cfm) | cfm min (cfm) | face velocity fpm (fpm) | notes | static pressure drop inwg (inWG) | throw 50fpm ft (ft) |
|---|---|---|---|---|---|---|---|---|
| perforated_ceiling | 12x12 | 20 | 180 | 60 | 300 | Perforated face supply diffuser 12x12 neck; very low face velocity; low NC; typically for sensitive environments or variable flow systems with high turndown | 0.02 | 8 |
| perforated_ceiling | 24x24 | 22 | 400 | 150 | 300 | Perforated ceiling diffuser 24x24 neck; high-capacity low-velocity | 0.03 | 10 |
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