What are the differences between centrifugal fans and axial fans?
A. Centrifugal fans have an impeller with blades set in a spiral. Centrifugal fans move the air at right angles to the fan intake, centrifugally spinning air toward the outlet. As the impeller turns, air enters the fan close to the shaft and moves perpendicularly to the opening in the fan casing. The blades of axial fans force air to move parallel to the shaft.