Grade 7 Filter: Air Line. Provides removal of liquid water and oil. Removes solid particulate to 1.0 micron with a 1.0 ppm w/w maximum remaining oil content (established in accordance with CAGI standard ADF400 and is based on 100°F inlet temperature). The first stage of filtration captures larger particles with alternating layers of fiber media and screen. The second stage of filtration coalesces aerosols and captures solid particles with multiple layers of epoxy bonded, blended fiber media.