Diffuser Grille Sizing: return_grille_single_deflection
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 | cfm max (cfm) | cfm min (cfm) | face velocity fpm (fpm) | notes | static pressure drop inwg (inWG) |
|---|---|---|---|---|---|---|
| return_grille_single_deflection | 12x6 | 220 | 80 | 300 | Single-deflection return/exhaust grille 12x6 face size; face velocity 300 fpm typical; no throw metric for return; NC of return grilles dominated by system SP not diffuser geometry | 0.01 |
| return_grille_single_deflection | 24x12 | 700 | 300 | 300 | 24x12 return grille; commercial ceiling return or high-wall mount | 0.02 |
| return_grille_single_deflection | 36x24 | 1,800 | 700 | 350 | Large return grille; central plenum return; face velocity may be higher for plenum return applications | 0.03 |
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