Oil Mist Eliminators or filter out oil mist created by machines before the mist is expelled into the ambient environment. Oil mist is created by machines mechanical action such as: vacuum pumps, compressor pumps, gears, transmissions, reciprocating engines, turbines, etc. Oil mist is a potential health and environmental hazard. Additionally, oil mist creates an oil build-up or residue on everything within the machineries environment. Some machines, such as oil-sealed pumps are used and are oil mist free and the need for an oil mist eliminator is not needed. When choosing an oil mist eliminator, the following should be considered and determined.