The WI nix replacement filter J for the hr. series air purifiers includes one coated true HEPA filter and one coated Deodorization (CD) carbon filter. The filters are especially designed to work with the fully automatic sensors of the hr. series air purifiers themselves, to improve indoor air quality. The filters are designed to Combat the level of airborne particles and odors in the indoor environment. The coating on the true HEPA filter reduces bacteria in the air. The true HEPA filter itself is 99. 97percent efficient in reducing particulates and VOCs, down to 0. 3 microns in size.