This Airvent 442829 Axial Tile Extractor Fan is a 100mm timer model designed for operation in conjunction with the room light switch. When the light is switched on, the fan activates, and it continues to run for a pre-set, adjustable time after the light is switched off. This fan requires a permanent live, switched live, and neutral connection (3 wires excluding earth) at the fan position for the timer function to operate. The fan operates on Mains 220/240V AC 50Hz. It has an extraction rate of 20 litres per second (75 cubic metres per hour) and a power consumption of 20 watts. The sound output is 41dB(A) at 3 meters. It is Class II double insulated and IP24 rated. Dimensions are 141mm wide x 141mm tall x 32mm deep (beyond the installed surface), with a 99mm diameter spigot that extends for 105mm. It is designed for connection to 100mm / 4 inch ducting. Manufacturer: Airvent.