wall exhaust fan details NO:Heng25B Free Mode:HL-250S-25B Material:Plastic Power:45W m3/h:750m3/min Voltage:220V Frequency:50Hz Installation Size:285×285mm Panel Size:335×335mm Singlel Size:340×340×120mm Outer Packing:10pcs/carton Carton Size:655×360×720mm G.W:17.5Kg Color:Golden Switching mode:Unidirectional,Bidirectional Welcome new and old customers come to take up co-operation.