Through model experiment, the wing model of T35,YTCZ,DZ series of axial fan has been determined to be cylinder wheel hub sructure.The modification design has been carried on ,flow loss rduced in the stricture,thus fan efficiency has been increased 77% in the terms of outlet round area,89.5% outlet circle area.The A sound level has been reduced 3.6db.The T35,YTCZ,DZ series axial fan is divided into 5 kinds of blade installation angle such as 15°,20°,25°,30°,and so on. All kinds of T35,YTCZ,DZ axial fan are adopted straight jointed srcture of the impeller and the motor.Under 60m/in of the impeller’s velocity,there are 3 kinds of rotational speeds to be mathched,2900,1450 and 960r/min. FT35,YTCZ,DZ-F axial fan is a derivation product from T35 too,made of glass fiber reinforced plastic material.Its metal parts are coverd by anticorrosion level,and prevent corrosion effectively. Note: The matched motor is three –phases one. Suitable Situation The T35,YTCZ,DZ axial fan suits in ventilation,deliver or exhaust in all kinds of civil and industry architectures. Standard carried out GB/T1236-2000”Industry Ventilator,Performance Test through Standarized Air Pipe”(to equate ISO5801:1,997) GB/T2888-91”Air Blower and Luo Tribulus Air Blower Noise Measurement Method”