louvered exhaust fans 1)Centrifugal system 2)high quality,low noise ... saving 4)Copper motor Ventilation fan, axial ventilation fan,ventilator, louvered exhaust fans, greenhouse ventilating systemWe are a professional manager for ... *W*H)mmInput power kwMaterialsHammer style9FJ-900B1000*1000*4000.55 shutter, frame, wind set, fan blade are galvanized9FJ-1000B1100*1100*4000 ...