This type of fan adopts a new brushless DC motor, which is integrated with the cylindrical shell and the wind blade. It is installed through the flange, which has the characteristics of small volume, light weight, easy installation, and has the advantages of large air volume and low noise. Small vibration, small electromagnetic interference, power consumption, high efficiency, safe and reliable, long life and other excellent performance, can be widely used in computer systems, office supplies automation, automatic control equipment, electronic instruments and other equipped with DC power supply for ventilation and heat dissipation.