Ultra Quiet WC & Bathroom Extractor Fan The Silent 100 is a 100mm domestic axial powerful bathroom extractor fan for wall or ceiling installations, designed to solve ventilation problems in WC’s and bathrooms. The Silent 100 fan features an adjustable run-on timer. In automatic mode, the over-run timer calculates the amount of time to operate, depending on how long the fan has been running for. Fitted with motors mounted on silent elastic blocks, the Silent 100 extractor fan delivers incredibly quiet running and exceptional performance with stylish features. Numerous Quality Features Fitted with pilot light, backdraught shutter and airflow guide vanes as standard to improve pressure development and performance, the Silent 100 extractor fan is also available with numerous quality features including optional timer, humidity sensor, SELV and PIR models. The extractor fan also comes in either white or silver.  Intelligent Timer In automatic mode, the over-run timer calculates the amount of time to operate, depending on how long the fan has been running for. (Alternatively it can be manually set to 5, 20 or 30 minutes run-on time). Adjustable Timer After disconnection, the shut off time can be delayed between 1 and 30 minutes. Adjustable Humidity Sensor The level of humidity for the bathroom can be chosen from between 60% and 90% Relative Humidity (RH). The extractor fan will continue to work long enough to reach the selected level. PIR Automatically starts up when the fan detects movement at a maximum of 4 metres. Back Draft Shutter To prevent air entry and limit heat leakage when the extractor is not operating. It opens due to the pressure of the air.