Side channel blowers, also known as vacuum pumps or vacuum compressors, can generate significantly higher pressures than industrial fans. However, a side channel blower generates lower air flow than, for example, centrifugal fans. The operating principle of vacuum pumps has its own technology: the air gets sucked in through a fast rotary vane impeller. After this, the air in the side channel blower gets pushed and compressed outwards by the centrifugal force. It flows through the side channel back into the inner part of the vacuum blower and gets compressed again between two further blades. The second compression enables the pumps to generate significantly higher differential pressures.