High Pressure Centrifugal Blower is suitable for all applications requiring considerably higher pressure than those can be achieved using centrifugal fans. The Centrifugal Blower uses side channel exhausters in all those applications requiring an operating vacuum higher than the one achievable by a fan, but not as to require the use of a vacuum pump. The Centrifugal Blower is designed with rotating parts not in contact with the casing of the blower and so no friction during operation. The High Pressure Centrifugal Blower does not require internal lubrication and thus gas moving through the Centrifugal Blower remains uncontaminated and completely free from oil.