The fan is a mechanical device that increases the gas pressure and delivers the gas side by side by relying on the mechanical energy input. Fan is China's customary abbreviation for gas compression and gas transmission machinery, usually referred to as fan, blower, wind turbines.

Fans are widely used for the ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings, and for the ventilation and ventilation of boilers and industrial furnaces. Cooling and ventilation in air conditioning equipment and household electrical equipment; Drying and feeding of grain, inflating and propelling of wind tunnels and hovercraft