Key Components of Fans
Impeller or rotor—A series of radial blades attached to a hub. The assembly of the hub and blades is called the impeller or rotor. As the impeller rotates, it creates a pressure difference and causes airflow.
Motor—It drives the blades so they may turn. It may be direct drive with the wheel mounted on the motor shaft or belt driven with the wheel mounted on its own shaft and bearings. It is important to note that fans may also be driven by other sources of motive power such as an internal combustion engine, or a steam or gas turbine.
Housing—Encloses and protects the motor and impeller.