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The Winix 113250 Replacement Filter E 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 E is compatible with Winix Air Purifier units P450 and B451.