Fantronix WISPA Light Switch Activated and Run-on-Timer Function Bathroom Extractor Fan. 150x150x23mm External Size, 100mm / 4 inch diameter vent. Energy efficient and Long Lasting Motor - White

You will need Switched Live, permanent Live and Neutral mains voltage connection. Powers on with your light switch and can be set to run between 2 and 30 minutes after the light is switched off. High airflow while maintaining a low noise level of 29 dBA. Can be wall or ceiling mounted. A backdraft shutter is preinstalled to prevent contaminants from entering the house. Fascia measures 150 x 150mm and has a slim profile of only 23mm. The connector is 99mm diameter (for 100mm hole/duct) and extends 79mm into the wall. Powered by a durable, efficient motor, offering an extraction rate of 90 m³/hour (25 l/s). Complies with Building Regulations Part F and L. Can be wall or ceiling mounted. The fan is equipped with a backdraft damper to prevent back flow and heat losses., Weight: 2.20462262 pounds, Manufacturer: Fantronix