Centrifugal fans have axial air inlet and radial air outlet, and use centrifugal force to do work to increase the pressure of the air. Therefore, under the same size (and speed), the generated pressure is greater than that of axial flow fans, but the air volume is smaller than that of axial flow fans.
The axial flow fan is axial air inlet and axial air outlet. Through the inclination angle of the blade, the thrust (lift) is used to do work. Therefore, under the same external size (and speed), the pressure generated is much smaller than that of the centrifugal fan. Under the structure, because the flow area is much larger than that of the centrifugal fan, the air volume is larger than that of the centrifugal fan.
