Ltpgtbehind the grille of the vent axia t series wall model is a range of high performance extractintake ventilating units designed to fit through most wall thicknesss using telescopic liners supplied t series also features a unique speed control pack which enables high medium or low speed to be preset to suit room size or required dutyltpgtltpgtthe vent axia ecotronic controller gives even greater running economy with its minimum speed setting and e mode tx models are suppl