Working principle of centrifugal fan and the turbine compressor are basically the same, just due to the low gas flow rate, pressure changes small, generally does not need to consider the change of the gas volume, namely the gas as incompressible fluid handling. Centrifugal fan can be made into right-handed and left-handed two types. From motor side face, wheel clockwise, called right rotating fan, counterclockwise, called left-handed.

Centrifugal fan is depending on the input mechanical energy, improve the pressure side by side to send gas machinery, it is a kind of driven fluid machinery. Centrifugal fan is widely used in factories, mines, tunnels, cooling towers, vehicles, ships, and the structure of the ventilation, dust and cooling; The ventilation of the boilers and industrial furnaces and wind; Air conditioning equipment and household appliances in cooling and ventilation; Grain drying and submitted; Wind tunnel and become a hovercraft inflatable and propulsion, etc.