Manrose Intervent BVF100T 4\" Square Extractor Fan with Timer designed for those looking for something conventional and practical. A great performing fan with an affordable price tag. Designed for wall, ceiling or window mounting, this comprehensive range offers a wide selection of models for use in bathrooms and toilets. BVF100T has an adjustable run on timer for use where there is a permanent and switched live available at the fan.Quiet and efficient, the 100mm (4\") series has an impressive extract rate of 85m3/hr, 23 liters per second. The units are all manufactured using high ABS thermoplastics for strength and durability, aesthetics and easy cleaning. Power is provided by a single phase induction motor with pre-oiled bearings for a long, maintenance- free life.Designed to comply with the 2006 Building Regulations on Ventilation (F1). BVF100 Series designed for wall, ceiling or window mounting through 100mm (4\") diameter flexible or rigid pipes or Manrose low profile, flat channel ducting systems.  220-240V - AC. 50Hz . Single phase consuming 14 watts. These fans are double insulated and do not require an earth. All wiring must comply with current IEE regulations. A double pole isolating switch, having a contact separation of at least 3mm in all poles, must be used with a 3 amp fuse fitted. The fan must not be accessible to a person using either the shower or bath and mounted a minimum of 1.8 metres from the floor.