Product Name：?[shutter window mounted ventilator fans] Product Type : A481,A482, A483 Rated Voltage: 250V/230V/220V/110V Rated frequency: 50Hz/60Hz Rated input power: 22W~35W Air Output: 300m3/h~860m3/h Noise: ≤35dB Installation dimensions (L﹡W): 195*195 245﹡245 295*295 (mm) Cover material : ABS Double outer cover,more safety. Adopting import NSK axletree motor with super quiet and long life. The surface adopt import ABS material, smooth ,waterproof,corrosion-resistance,anti-discolor Elegant and nobleness in appearance