Refresh your indoor air with the Filtrete™ Allergen Reduction HEPA Type Room Air Purifier Filter. From dust and lint, to pet dander and pollen, this filter helps capture allergens in your home. A HEPA type rating means the filter captures 95% of airborne particles as small as two microns in size* to help you achieve cleaner, fresher indoor air. *from the air passing through the filter. Initial efficiency value.