Unique Design Exhaust Ventilation Fan Shanghai weima electrical equipment limited company is mainly production axial flow fan and centrifugal fan for international market, OEM &ODM service customized, welcome to you visited our top axial venlitation fans, www.weimash.com. Model: YWF4E/4D/6E/6D630 Speed:900~1360R/MIN AirFlow:8900~12260m3/h Power:500~850W Voltage:220V/380V