Atmospheric Ejective Air Precleaner. This part is used to remove dirt and debris from the air stream prior to the air going into the filter housing. It is up to 82% effective on debris down to 5 microns. It comes in 2-, 3-, 4-, 5-, 6- and 8-in. inlet sizes covering air flow ranges from 10 to 1,400 cfm's. The precleaner is made from engineered polymer and cleans the air five times before it enters into the filter housing.