• Material: UV resistant white plastic (prevents ageing caused by exposure to sunlight). • Nominal diameter 120 mm. • Motor protected against thermal overload, with shaft turning in ball bearings; 2 operating speeds controlled electronically from pcb. • Air flow between 120 m3/h and 175 m3/h. • Version with advanced timer: the appliance is equipped with a pcb allowing delayed switch-on and/or switch-off at the minimum or maximum speed. The length of the time-lagging for switching on and off, as well as the operating speed, can be set during installation. In addition, the appliance can run automatic switch-on cycles. • Equipped with non-return damper preventing unwanted backdraught when the fan is off.