• Version powered by safe low voltage supply (SELV - 12V) requiring transformer, purchased separately • 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 system by which the louvres of the grille are opened and closed automatically.