Air Filter The air filter can filter out dirt, oil and water. Depending on the type of compressed air filter, we can effectively remove up to 99.9% of these impurities. Three Types of elements are available 1. A grade 3 micron pre-filter 2. B grade 1 micron separator filter 3. C grade 0.01 micron separator filter • A Grade 3 Micron Pre-Filter This 3 micron pre-filter has a 3 micron ceramic standard compressed air filter and water separator. It removes large liquid loads and all solid particles 3 micron and larger. This air filter can be used as a separator downstream of the after cooler of point-of-use filter where heavy liquid loads are expected (air systems without after coolers or dryers). • B Grade 1 Micron Air Line Filter This 1 micron compressed air filter removes all liquid water, oil aerosols, and all solid particles 1 micron and larger. This air filter can be used as a general filter for shop air, after filter for pressure wing desiccant dryers, and as a point-of-use filter on systems utilizing after coolers or dryers. • C Grade 0.01 Micron Air Line Filter The 0.01 micron coalescing filters coalesce and remove 99.99% of oil aerosols for virtually oil free air. This air filter can be used with oil - lubricated compressors to produce oil free air for painting (spray and powder), molding for plastics, instrumentation and controls, fluid logic and air bearings.