... filter cotton ,pre filter for spray booth ,corase filter cotton , washable filter media1,Application: ≥5μm, Filter dust , (especially used ... pre-filter through air filter program 2,Feature:1,washable and reusable2,Low initial resistance3,Large dust holding capacity4, ... : synthetic fiber with gradual density, inlet side is blue.Washable: about 4-5 timesEN779 class: G3Average arrestance:88%(ASHRAE52 ...