With four-stage pre-filtration, the WNA AMD-035 Membrane Dryer has a flow rating of 35 SCFM and maximum working pressures of 150 PSI. The first- and second-stage filters remove moisture, liquids, dust, rust, scale and other contaminants to 5 microns. An automatic float drain under the second-stage filter opens and expels all collected liquids whenever an ounce or more is present. It is fully automatic with no continuous air loss. The third and fourth stages remove any remaining particles down to .01 microns as well as absorbing any remaining moisture or oil vapors. The membrane dryer lowers the humidity level by venting it harmlessly into the surrounding atmosphere.