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The Winix 112180 Replacement Filter N is a complete one year filter. 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 Coated Deodorization (CD) Carbon Filter uses an activated coating to reduce large amounts of odor in the environment, extending the life of the True HEPA filter. The genuine Winix Filter N is compatible with Winix Air Purifier units NK100, NK105, and QS.