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Using piston technology this is a compact
It has 19 pockets (including 2 long shank side tool pockets) interior and exterior pockets
Switch live overide and back draught shutters
w - to 42 dB(A)
Greenwood Acoustic MA3051 over-2000 Using piston technology this isGreenwood Acoustic MA3051 wall ventilator in white providing acoustic attenuation to Dn,e,w 55dB(A), suitable for external wall thicknesses of 140mm and above and can be installed in internal wall constructions of between 100 150mm. Equivalent performance 2500mm2. Supplied with internal controllable vent and white sand external grilles. Conforms to acoustic requirements of Noise Insulation Regulations (NIR) 1975, one of only a small number of products