Winix 115115 Replacement Filter A The Winix True HEPA + 4 Filter Activated Carbon Replacement Filter includes a True HEPA filter and 4 carbon pre-filters, helping to rid the air of dust, allergens and other particles Use to replace worn out filters, Helps remove allergens and other airborne particles while absorbing odors and VOCs Fits Winix air cleaner models 5300-2, C535, P300, 6300-2, 5300, 5500, 9000, 5000,5000B Includes 4 carbon pre-filters for year-round use, Recommended replacement schedule of carbon pre-filter is once every 3 months The true HEPA filter captures 99.97% of particles and impurities as small as 0.3 microns