Centrifugal fan, also known as Shell Type fan, is a fan with strong suction and push power, which has the ability to create pressure and transmit good wind. For that reason, centrifugal fans/ shell type fans are commonly used to absorb air and exhaust gases, toxic substances as well as dust produced by factories, milling system, rice production or wood factory, etc. In addition, the sort of fan is regarded as the heart of Air Shower or Sterilization Chamber, widely used in laboratories, hospitals, and places called cleanrooms or clean zones.