Description Advanced air drying technology for shop use. Lightweight, easy-to-install, and simple-to-operate, the Dryaire Membrane System maintains -40°F dew point while achieving 0% compressed air humidity. It removes oil and sub-micron particles down to .01 micron. Stage 1 filter provides removal of water and contaminants down to 5 microns Stage 2 coalescer provides removal of oil and sub-microns particles down to .01 microns Stage 3 membrane dryer is maintenance free, no regeneration required