1) Intake or blow off; 2) Axial flow type; 3)wide rage sizes. Axial Blades1)axial flow type, intake or blow off;2)aluminium alloy;3)size from125mm to 300mm;4)with adoption of pneumatic and acoustic scuence; 5)high pressure coefficient abd big flow,6)widely applied in the chemical,light industrial and food industrial as well as the government departments,sport centers and civil construction;