The fundamental difference between the three types of fans lies in the direction of airflow passing through the impeller, which determines their vastly different performance in terms of pressure, flow rate, and efficiency.

Centrifugal Fan

The airflow enters the impeller along the axial direction, and after the blades rotate, it is thrown towards the outer edge of the impeller to leave perpendicular to the axial direction. The snail shell converts dynamic pressure into static pressure, generating a higher total pressure. Suitable for situations where significant pipeline resistance needs to be overcome.

• Features: High pressure head, medium flow rate, relatively high noise

Typical pressure range: 200~3000+Pa

Axial Fan

The airflow flows in and out parallel to the axis of rotation, and the blades exert axial thrust on the airflow. Compact structure, high flow rate, and low pressure head are its most prominent features, suitable for high air volume ventilation situations that do not require overcoming large resistance.

• Features: Low pressure head, high flow rate, low noise

Typical pressure range: 30~500 Pa

Mixed Flow Fan

Also known as diagonal flow fan, the airflow has both axial and radial components, flowing along a conical surface. The performance is between centrifugal and axial flow, balancing moderate head pressure and high flow rate, with a more compact volume and flexible installation.

• Features: Medium pressure head, large flow rate, moderate noise

Typical pressure range: 100~1500 Pa