• Material: UV resistant plastic (prevents ageing caused by exposure to sunlight). • Nominal diameter 100 mm. • Motor protected against thermal overload, with shaft turning in self-lubricating bushings, coupled to screw type thermoplastic impeller with wing profile blades. • Maximum air flow: 90 m3/h. • Equipped with electronic timer designed to shut off the motor automatically after a set interval, selectable during installation in the range 3’-20’ (default setting 3’). • Equipped with system by which the louvres of the grille are opened and closed automatically.