A fan is a mechanical device that relies on input mechanical energy to increase gas pressure and discharge gas. It is a passive fluid mechanical device. Fan is the customary abbreviation for gas compression and gas transportation machinery in China. Generally, fans include ventilation fans, blowers, and wind turbines.
Fans are widely used for ventilation, dust removal, and cooling in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings, as well as for ventilation and induced draft in boilers and industrial furnaces; Cooling and ventilation in air conditioning equipment and household appliances; Drying and selection of grains, inflation and propulsion of wind tunnel sources and hovercrafts, etc