ELGi's Airmate Downstream Filters (AF Series) - 21 to 6475 CFM The atmospheric air contains moisture, particle contaminants, microorganisms, and gases. When this air gets compressed, the concentration of such particles these increases by 6-10 times (equal to compression ratio). However, when this atmospheric air gets compressed by a compressor, other contaminants like oil and metal traces get added during the compression process. This is why it is essential to remove these contaminants from the compressed air before using them for any application. These are suitable for applications that require filtered air for reliable performance. The AF series filters provide customers with best-in-class filtration and the lowest pressure drop. These filters are manufactured in compliance with applicable international standards ASME(USA), CE (Europe), CRN (Canada), AS 1210(Australia), and designed as per the international quality standards.