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DB-AAB46
Greenwood AAB Acoustic Airbrick
Airflow: 2500mm² Equivalent Area, 46DB Dn,ew (Open position)
Internal Hit & miss vent

External grille

Acoustic background ventilator Provides acoustic attenuation to Dn,e w 46 dB
2500mm2 equivalent area
Supplied with integral external grille Weight: 6.5Kg Material: Casing – pre-galvanised grey steel.
Two steel plate baffles support the perforated aluminium airways encased in sound absorbent mineral wool.
An outer baffle assembly and acoustic linings are set behind louvred external grille.
Dn,e,w (C;Ctr) = 46(0;-2) dB
Dn,e,w (C) = 46dB
Dn,e,w (Ctr) = 44dB
Dn,e,w: Average weighted performance across frequency range C: Pink Noise Ctr: Road Noise
Building Regs Doc F compliant - System 1 & 3
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