A ceiling fan is an electrically powered mechanical fan that is mounted on the ceiling of a space. Unlike air conditioners, fans do not change the air temperature, but instead use hub-mounted rotating blades to move the still and hot air of a room with various speeds of movement. Manually operated Punkah-type ceiling fans, originating from India, date back to 500 BC, but following the energy crisis in the late 1970s and early 1980s, ceiling fans found commercial success as an energy conservation application. Ceiling fans include an electric motor, blades, blade irons, flywheel, rotor, and a system to mount the fan unto the ceiling.
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