Impellers including A,B,C,D,E,F,G series,are widely applied in central air condictioning equipment,referigeration facilities,screw air compressor,ven-tilation of electric appliance and bulidings. The diameter of type A is from 230 to 400. FZL Series of Impeller, Type A Qty.of fan blades:3 to 5 Steel Hub Sheet Steel Blade Bracket Sheet Aluminum Blades as standard