Diffuser Grille Sizing: round_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) |
|---|---|---|---|---|---|---|---|---|
| round_ceiling | 10 | 27 | 280 | 125 | 390 | Round ceiling diffuser 10-in neck | 0.04 | 11 |
| round_ceiling | 12 | 30 | 450 | 200 | 400 | Round ceiling 12-in neck; conference or small lobby | 0.05 | 13 |
| round_ceiling | 6 | 22 | 100 | 40 | 370 | Round ceiling diffuser 6-in neck; residential or small commercial; 360-degree discharge pattern | 0.02 | 7 |
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