... ~352kg, Volume:500~21000m3/h, Speed:870~3500r/min, Pressure:490~1800Pa, Shipbuilding Fan blower for shipyard use Draft fan:Weight ... ~352kg,Volume:500~21000m3/h,Speed:870~3500r/min,Pressure:490~1800Pa,Voltage:380V/440V,50HZ/60HZ1. 4-72 series centrifugal ...