Centrifugal Fan – Description
A centrifugal fan is a mechanical device used to move air or gas by converting rotational kinetic energy into airflow energy. It consists of an impeller (a wheel with blades), a casing (usually scroll-shaped like a snail shell), an inlet for air entry, and an outlet for air discharge. The impeller is mounted on a shaft and driven by an electric motor. Unlike axial fans that move air in a straight line, centrifugal fans change the direction of airflow by 90 degrees, pushing air outward from the center to the sides of the casing.

Operation
When the motor rotates the impeller, air enters the fan through the central inlet. The rotating blades accelerate the air outward due to centrifugal force. As the air moves along the blades, its velocity and pressure increase. The scroll-shaped casing collects this high-speed air and directs it toward the outlet duct. This process produces a continuous stream of pressurized airflow, making centrifugal fans suitable for ventilation, dust collection, air conditioning systems, and industrial exhaust applications where higher pressure is required.