• 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 simplified timer, operating at one speed: the appliance is equipped with a pcb providing a delayed switch-off function. The length of the switch-off delay, as well as the single operating speed, min or max, can be set during installation. • Equipped with non-return damper preventing unwanted backdraught when the fan is off.