100% oil free air delivery; factory engineered, factory guaranteed, superior product; improved volumetric efficiency and reduced operating temperatures; alloy steel hardened and ground timing gears, oil splash lubricated; anti-friction bearings; vertical flow design prevents accumulation of corrosive matter inside the main chamber; rotary oil sealing; large inlet and outlet connections for minimal loss; all bearings are oil splash lubricated for effective lubrication; rigid one piece CI casing and end plates; easy rotor timing setting; no vanes, valves or rings to wear; dynamically balanced rotor shaft assembly (Grade 6.3 ISO 1940-1986); alloy steel toughened shafts ground to close tolerances; performance testing as per standard test procedure STP-01 based on BS 1571-2:1975 and ISO 1217:2009; all blowers are manufactured on state of the art, imported CNC machines, machined to close tolerances with high degree of accuracy on profile machining, ensuring high volumetric efficiency; and all major components are interchangeable making Everest the first and only manufacturer to attain the same.