Envirovent Silent 100mm 4" Silver Ultra Quiet WC & Bathroom Extractor Fan with Timer - SIL100STThe Envirovent SIL100ST SILENT100 Silver silent IP45 axial extractor fan with adjustable over-run timer has a stylish design suitable for wall or ceiling mounting in toilets and bathrooms.The motor is mounted on silent elastic blocks, the fans deliver incredibly silent running and exceptional performance. Complies with all current building regulations.Fitted with pilot light, backdraught shutter, and airflow guide vanes as standard to improve pressure development and performance.Fitted with an adjustable timer that after disconnection, the shut-off time can be delayed between 1 and 30 minutes. It requires both a switched supply and a permanent life and earth.The SIL100ST is one of the more powerful bathroom fans, operating at 95m³/hr but is also one of the quietest and is barely au