Fan (machine)

A fan is a powered machine that creates airflow. A fan consists of rotating vanes or blades, generally made of wood, plastic, or metal, which act on the air. The rotating assembly of blades and hub is known as an impeller, rotor, or runner.

Usually, it is contained within some form of housing, or case.
This housing will allow air to pass through as well as directing the airflow, or increasing safety by preventing objects from contacting the fan blades.
Most fans are powered by electric motors, but other sources of power may be used, including hydraulic motors, handcranks, and internal combustion engines.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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