... easily for installation 4. easily to replace the element Air Dryer Filter: Product introduction:Grades:totally 5 grades as HF9, ... aerosols; removes solid particles to 0.01 micron (0.001 ppm w/w maximum remaining oil content)Corrosion resistant ... designed & manufactured HOLYSUN brand HSD series Refrigerated Air Dryer,Absorbing Air Dryer,After Cooler,Air chiller Set,Industry using Water Cooler,HF series ...