Blowers work on the principle of centrifugal force or positive displacement to create air movement:

1. Centrifugal Blowers : Centrifugal blowers use a rotating impeller to accelerate air radially outward. The air then changes direction due to centrifugal force and exits the blower in a tangential direction. These blowers are suitable for applications requiring moderate to high pressures.

2. Positive Displacement Blowers : Positive displacement blowers use a mechanism of internal chambers and lobes or screws to trap and move air. As the chambers expand and contract, air is pushed or pulled through the blower. These blowers are ideal for applications requiring a steady flow of air at relatively lower pressures.