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The Winix 116131 Replacement Filter I is a complete one year filter set. The True HEPA Filter is coated with an Anti-microbial solution specially designed to repel the growth of microbes and bacteria on the filter; and 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 Washable AOC™ Carbon Filter uses activated carbon granules to trap large amounts of odor in the environment, extending the life of the True HEPA filter. The genuine Winix Filter I is compatible with Winix Air Purifier unit C555.