Ubbink 125mm Sound Attenuator hood_type_wall Zehnder Old P/N 990 326

Zehnder Old P/N 990 326 121

utility rooms

Diameter 180mm

Zehnder P/N 655 010 235

Tamaya HP and Tonda models

Ubbink 125mm Sound Attenuator hood_type_wall Zehnder Old P/N 990 326Indoor 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 distribution system, including the