The WI nix replacement filter N for the NK100, NK105 and QS air purifiers. The all-in-one circular cassette includes a hair collecting Pre-Filter, coated deodorization (CD) carbon filter and true HEPA filter that is 99. 97percent efficient against particles allergens and variable organic compounds VOCs down to 0. 3 microns in size. The filters are especially designed to work with the fully automatic sensors of the WI nix 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.