Axial flow fan is a general-purpose ventilation device, mainly used for efficient ventilation, air exchange, heat dissipation and cooling. It boasts such advantages as large air volume, stable air pressure, high efficiency and energy saving, as well as stable operation. Featuring a compact structure and reasonable design, it is easy to install and maintain, and has a long service life. The fan runs with low vibration and high reliability, enabling rapid indoor and outdoor air circulation, effectively exhausting hot air, odors and dust, and improving ambient air quality. It is widely suitable for various scenarios including factories, workshops, warehouses, buildings and machine rooms, meeting the ventilation and cooling requirements of both industrial and civil fields. It is a conventional ventilation device with strong practicability and stable performance.