Gardner Denver FSG Series General Purpose filters are leading the way in compressed air treatment innovation! Airborne contaminants from the atmosphere, such as dust, water vapor, and hydrocarbons enter the air system through the compressor intake. These contaminants, usually 4 million particles per cubic foot, can easily pass through a typical compressor intake filter since over 80% of these particles are less than 2 microns in size. The compressor also contributes to the problem with wear particles, oil vapor and fine aerosols that leak past glands and seals from the oil sump into the compression chamber. The 4 types of filters within the FSG Series product line allow for the removal of particles, from 5 micron to removing of oil vapor and odors, to allow for the purest of air within your compressed air system.