Envirovent's Silent 100 range. The fans are designed to solve ventilation issues in bathrooms and toilets. The motors are fitted on silent elastic blocks, the Silent 100 fans are incredibly quiet running with exceptional performance and stylish appearance. 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. Fitted with motors mounted on silent elastic blocks, the Silent 100 extractor fan delivers incredibly quiet running and exceptional performance with stylish features.