Manrose Intervent NVF100T Timer Extractor Fan for 4 Inch / 100mm ducting. Suitable for wall or ceiling mounting through flexible or rigid pipes. It has an extraction rate of 85m³/hr (23 l/sec) and a sound volume of 41.0dB(A). Features pre-oiled bearings for a long, maintenance-free life and complies with building regulations on ventilation. Double insulated, requiring no earth connection. Operates on 230V/20Watt. Dimensions: 156mm x 156mm x 28mm.