Ring Blower / Regenerative Blower / Side Channel Blower / Vortex Blower: Construction Features: 1. Rugged Cast aluminum housing, cover, impeller, and muffler tower 2. Removable cast iron flanges bolted to a sheet metal manifold 3. Direct Drive TEFC motors 4. Carbon steel shaft and zinc plated hardware 5. Permanently sealed Motor bearings for 20, 000 hours life Applications: Used in Air Assisted Breathing Spa Air Supply Air-Assisted Inflation or Support Fish Farm Air Supply Vacuum Pick-Up or Hold-Down Air and Gas Sampling, Boosting, or Circulating Electronic parts Cooling Gas, Vapor, and Fume Recovery, Venting and Treatment Solid Material Transporting, Separation and Collection Parts Blow-Off and parts Drying Liquid Solution and Media Agitation and Aeration http://www.cleantekindia.com/regenerative-blower.htm