BYZ type low noise axial flow fan is a new generation of low noise axial flow fan production, it is used the optimization design of aerodynamic principles and advanced processing technology, the whole machine is reasonable in structure, durable, safe and practical.It is using adjustable moving blade aluminum alloy impeller, and the body painted by high-temperature, so that it never fades.In the same installation position, with the advantages that can realize bidirectional ventilation, the blade angle can be adjusted according to the requirements for the wind,compared with axial flow fan now common use in our country, air volume increased by 42%, air pressure increased by 30%, noise (A noise) decreased from 10 to 18dB (A), total pressure efficiency up to 82.3%.The maximum air volume up to 140000 m3/h.