The Vent-Axia TX7WL Wall Fan 220-240V is the UK’s No. 1 commercial fan. Behind the grille of the T-Series wall model is a range of high performance extract/intake ventilating units designed to fit through most wall thicknesses using telescopic liners supplied. For walls of exceptional thickness additional liners can be used. T-Series also features a unique speed control pack which enables high, medium or low speed to be pre-set to suit room size or required duty. Conduit entry is provided for concealed wiring. T-Series controllers may be used with this model to obtain a choice of speeds, reversible airflow direction and automatic sensor operation. When used with a T-Series TSC controller, the speed control pack is removed from the T-Series ventilating unit and fitted into the 3-pin socket in the back of the controller. The Vent-Axia Ecotronic controller gives even greater running economy with its minimum speed setting and \'E\' mode. When using the Ecotronic controller the speed control pack remains in the fan.