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The Winix 115122 Replacement Filter G is a one year True HEPA replacement filter set. The Washable 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. It can be washed up to 3 times in a year which, extends the effectiveness of the filter. The genuine Winix Filter G is compatible with Winix Air Purifier unit 5500.