Diffuser Grille Sizing: 4way_square_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) |
|---|---|---|---|---|---|---|---|---|
| 4way_square_ceiling | 10 | 28 | 250 | 100 | 380 | 10x10 neck; standard open office ceiling diffuser | 0.04 | 10 |
| 4way_square_ceiling | 12 | 30 | 400 | 160 | 390 | 12x12 neck; high-flow open plan office or lobby | 0.05 | 12 |
| 4way_square_ceiling | 14 | 33 | 550 | 250 | 420 | 14x14 neck; high-volume zone supply | 0.07 | 14 |
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