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Sound Absorption: ventilation grille
Sound absorption coefficients and NRC ratings for building materials — fiberglass, carpet, concrete, drapery, ceiling tile, etc. per ASTM C423 and ASHRAE Ch.49
| material | product variant | alpha 1000 (dimensionless) | alpha 125 (dimensionless) | alpha 2000 (dimensionless) | alpha 250 (dimensionless) | alpha 4000 (dimensionless) | alpha 500 (dimensionless) | category | description | mounting | nrc (dimensionless) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ventilation grille | standard hvac | 0.5 | 0.3 | 0.5 | 0.4 | 0.4 | 0.5 | specialty | Ventilation grille (HVAC diffuser / return air) | Surface | 0.48 |
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