... Fan blower: Weight:25~352kg, Volume:500~21000m3/h, Speed:870~3500r/min, Pressure:490~1800Pa, Shipbuilding Fan blower for shipyard use Draft fan ... the vane wheel is mounted directly on the motor shaft extension.The vane wheel, being riveting structure ... awarded the International Quality Management Certificate ISO9001:2000 with complete manufacturing equipment, advanced technologies and perfect testing ...