This Airvent 150mm low profile extractor fan is designed for wall or ceiling mounting (with appropriate kit) and is Part F compliant. It features a back draught shutter and an airflow of over 216m3/h, with a sound level of 45dBA at 3m. The humidistat version automatically switches the fan on when condensation levels build up and turns off once the condensation clears. It can also be connected to work with the room light switch, requiring a permanent unswitched live and neutral connection. An additional switched live connection is required if timer functionality is needed. This is the larger model fan for connection to 150mm / 6" diameter ducting. The humidistat operates within a range of 60%RH - 90%RH. The fan is rated at 220-240V and 20W. IP44 rated.