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The Winix 116131 Replacement Filter I is a complete one year filter set. The True HEPA Filter coated with Anti-Microbial Treatment 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, while the anti-microbial treatment prevents growth of microbes and bacteria. The Washable Advanced Odor Control (AOC) Carbon Filter traps large particles, extending the life of the True HEPA filter and absorbs odor in the environment. The genuine Winix Filter I is compatible with Winix Air Cleaner unit C555.