Ceiling Fan
A ceiling fan is a mechanical fan that circulates air by using hub-attached revolving blades fixed on the ceiling of a room or space. Ceiling fans are usually electrically driven. They efficiently cool humans by boosting air speed. Fans, unlike air conditioners, do not lower ambient temperature or relative humidity, but they do have a cooling impact by assisting in the evaporation of sweat and increasing heat exchange by convection. Due to friction and waste heat from the engine, fans may add a little amount of heat to the room.
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