A fan is a powered machine used to create airflow. A fan consists of a rotating arrangement of blades or vanes, usually made of wood, plastic, or metal, that act on the air. The rotating assembly of blades and hub is called the impeller, rotor or runner. Usually, it's contained in some form of casin

The centrifugal fan is based on the principle of converting kinetic energy into potential energy, using a high-speed rotating impeller to accelerate the gas, then decelerate and change the flow direction, so that the kinetic energy is converted into potential energy (pressure).