What type of fan produces pressure by imparting tangential acceleration to air?

The type of fan that produces pressure by imparting tangential acceleration to air is the centrifugal fan. This fan design works on the principle of converting kinetic energy into dynamic pressure. As air enters the fan, it is drawn into the center and then accelerated outwards by the rotation of the blades, which are positioned tangentially to the airflow. This tangential acceleration creates a high-pressure difference that allows the fan to move air effectively through systems that require ventilation or air movement.

In contrast, an axial flow fan moves air parallel to the axis of the fan. It relies primarily on the lift generated by its blades, which function more like an airplane wing. Blower fans usually refer to mechanisms that can create positive or negative pressure to transport air, but the specific design that focuses on tangential acceleration aligns with centrifugal fans. Exhaust fans are designed to expel air from a space but do not generate the same pressure through tangential acceleration as seen in centrifugal fans.