Axial flow fan has a wide range of applications, which refers to the airflow in the same direction as the axis of the fan blades, such as electric fans and air conditioning outdoor fans that operate in axial flow mode. The reason why it is called "axial flow" is because the gas flows parallel to the axis of the fan. Axial flow fans are usually used in situations where high flow requirements and low pressure requirements are needed. Axial flow fan is fixed in position and moves the air. Axial flow fans are mainly composed of fan impellers and casings, with a simple structure but very high data requirements.