Mechanically, a fan can be any revolving vane or vanes used for producing currents of air, in winnowing grain, blowing a fire, or for ventilation. A fan can also be used for checking rapid motion by the resistance of the air; e.g., a fan blower or a fan wheel.
Mechanical revolving blade fans are put on the floor or a table, or hung from the ceiling, or are built into a window, wall, roof, chimney, etc., and also into instruments, e.g. a computer. They are also used to move air for cooling purposes, as in automotive engines and air-conditioning systems, and are driven by belts or by direct motor. Fans create a wind chill but do not lower temperatures directly.
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