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The Winix 115115 Replacement Filter A is a complete one year filter set. The True HEPA Filter captures 99.97% of particles and impurities as small as 0.3 microns, including pollen, mold, dust, pet dander and hair, other allergens and cigarette smoke. The 4-pack Carbon Filters traps large particles, extending the life of the True HEPA filter and absorbs odor in the environment. The genuine Winix Filter A is compatible with Winix Air Purifier units 6300, P300, 5300, 5500, 5300-2, 6300-2, and C535.