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25mm ID) B7553
4E has a low EC energy motor as opposed to the standard DC motor that was used in the CMEV
Dimensions: 30
Quiet operation
Ubbink Sound Attenuator 180mm Diameter, Length 1000mm duct_diameter_150mm 25mm ID) B7553Ubbinks 180mm Sound Attenuator Indoor sound is potentially a greater source of noise hindrance than outdoor sound as the insulation in buildings is improved. Mechanical ventilation units make sound, which may be experienced as noise hindrance, as they displace the air through the air distribution system. They emit sound by vibration and through the casing and the air distribution system. Sound is also generated as air travels through the air
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