1Centrifugal fan is the main flow along the radial direction after the axial flow into the impeller of the fan. This type of fan is made according to the principle of centrifugal action, the products include centrifugal fan, centrifugal blower and centrifugal compressor.
2 axial flow fan is the impeller that the airflow enters the fan axially approximately flows along the axial direction on the cylindrical surface. Such fans include axial fan, axial fan and axial compressor.
3The rotary fan works by changing the volume of the chamber by rotating the rotor. Common varieties are Roots blower, rotary compressor.