The ring blower (channel blower, air blower) made by aluminum alloy, that make it small body and light weight. Blower blades operate without coming into contact with the pump casing and with each other. Therefore, the blades do not require lubrication. Applications Versatile applications for Vacuum or Pressure Operation Features • Aluminum blower housing, impeller, and cover. • Continuous duty, non-pulsating operation. • Low noise and vibration, inlet and outlet have the internal silencer. • Could be mounted in any plane. • The oil-free design eliminates contamination of downstream components. • TEFC enclosure eliminates atmospheric contamination of motor windings and bearings.