An Exhauster or Blower consists of a rotating system of Shaft & Impellers operating in a specially designed casing with Inlet & Outlet connections. The shaft is made of High Grade Carbon Steel, machined & ground to accommodate the Impellers & Bearings. The Impellers are a composite section of casting / fabricated from high tensile aluminum, MS/CRC sheet, accurately balanced & are held securely on the shaft by heavy endwise locknuts.