Airflow rate approx 85 m3/h for connection to 100 mm diameter circular ducting. Motor mounted on silent-elastic-blocks which absorb the vibrations and allow offering very low noise level. All the fans are manufactured from injection moulded plastic fitted with automatic shutter and single phase 230V-50Hz class B low consumption motor equipped with thermal overload protection. All the fans are class II insulation IP45 rated and suitable to operate with air temperature up to 40ºC.