T-Series range is fitted with a Vent-Axia M-Tech motor, developed to improve performance and lower running costs, and maintain T-Series rugged reliability. With energy saving in mind TX models are supplied complete with an integral instantaneous automatic louvre shutter concealed behind the interior grille. The shutter can be set open with the fan motor switched off to provide natural ventilation without the security risk of an open window. This unique system allows for fast and trouble-free mains connection and are designed for use in single or double glazing and most types of glass and materials up to 32mm thick.