The fans adopted advanced CAD system software, the multi-objective optimization, performance indicates that design and development of high-tech products, compared with the same gauge pressure axial fans high, compared with the same machine number of wind centrifugal fan large, with high efficiency. Compact, easy installation, reliable operation; The fan axial or centrifugal than in the case of the same volume of wind, air pressure can be directly connected to the duct, horizontal or vertical installation, easy operation and low noise characteristics of : The fan casing is specially designed to greatly reduce the eddy current noise. The unit amount of wind, air pressure at the unit operating conditions than A sound level can be reduced 2-3B (A), while in the case of low speed, high availability Ming Fan pressure. In the industrial and mining enterprises and senior civil ventilation system can replace the low-pressure centrifugal fan or replaced without the need for a large number of high-pressure axial fan silencer measures. The products are divided into single-speed and two-speed two models (including single-speed and divided into high, medium and low speed), according to different occasions, can also produce a proof type, and change the angle of the wind turbine installation, change blades number and variable speed to achieve the requirements.