Shipbuilding Fan blower: Weight:25~352kg, Volume:500~21000m3/h, Speed:870~3500r/min, Pressure:490~1800Pa, Shipbuilding Fan blower for shipyard use ... Draft fan:Weight:25~352kg,Volume:500~21000m3 ... /h,Speed:870~3500r/min,Pressure:490~1800Pa,Voltage:380V/440V ...