Behind the grille of the T-Series wall model is a high performance extract/intake ventilating unit designed to fit through most wall thicknesses using the telescopic liner supplied. For walls of exceptional thickness additional liners can be used. Conduit entry is provided for concealed wiring. Features: Extract/intake model in 4 sizes: 6”, 7”, 9” and 12” Patented electronic shutter system ensures quiet, trouble free operation For the very best from your fan use the Ecotronic controller Easy fit connector Top Socket, standard on all models