Centrifugal Fans are usually made of MS (IS:20621079) with extra rigid casing, inspection window & drain plugs The Impeller is mounted on C-40 (IS:1570) shaft. Double Row self aligned BallSpherical Roller Bearings are used to ensure smoothest operation Fans are either 'V' Belt driven or Direct driven. For High Temperature (1000C to 3500C) application, Aluminium cooling disc is provided & the fans in such cases are painted with Heat Resistant Aluminium paint