This series of fans consists of a single-phase capacitor-operated asynchronous motor, a single flange cylindrical casing and fan blades. With the characteristics of large air volume, low vibration and low noise, the fan is mainly used for ventilation and heat dissipation in industries such as ground automatic control devices, large electronic equipment, cabinets, and electric welding machines that require large air volume. It can also be used for ventilation, ventilation, purification, etc. in buildings and workshops.