Fan, English: Draught fan
Fan is our country to gas compression and gas conveying machinery habit abbreviation, usually said fans include fans, blowers, wind turbines.
Gas compression and gas conveying machinery are the machinery that converts the rotating mechanical energy into the gas pressure energy and kinetic energy, and transports the gas out.
The main structural components of the fan are impeller, casing, inlet, bracket, motor, pulley, coupling, muffler, transmission parts (bearings), etc.
The non-powered ventilator is the air heat convection caused by the natural wind and the indoor and outdoor temperature difference, and promotes the turbine rotation thereby utilizing the centrifugal force and the negative pressure effect to drain the indoor fresh air.