Amazon.comThe Filtrete 1500 MPR Ultra allergen reduction filter not only vastly improves the air quality in your home, it also keeps your air conditioning and heating systems running efficiently, saving on utilities and maintenance costs. The electrostatic filter attracts and captures airborne dust, pollen, dustmite debris, lint, mold spores, pet dander, smoke, smog, bacteria, and particles that can carry viruses. With each pass through the specially pleated filter, the air in your living space improves, making for a healthier home environment. This highperformance filter outperforms comparable nonelectrostatic fiberglass and washable and reusable oneinch filters.1500 MPR UltraAllergen Reduction FilterAt a Glance:Electrostatic filter attracts and captures dust, pollen, dustmite debris, mold spores, pet dander, smoke, smog, bacteria, and particles that can carry virusesImproves air quality by cleaning air with each pass through the filterKeeps your furnace or air conditioner running efficientlyOutperforms comparable fiberglass and washable/reusable filtersPack includes four filtersBy removing dust from the air, the filter also reduces strain on your furnace and air conditioner, helping to keep them running efficiently (view larger).Electrostatic Design Captures More ParticlesThe 3M Ultra allergen reduction filter is made with both positively charged and negatively charged fibers that act like tiny magnets to attract airpolluting contaminants. Since particles in the air are either positively or negatively charged, they are attracted to and captured by the filter and kept out of your living space.Electrostatic filters, including the 3M Ultra allergen reduction filter, perform better than comparable nonelectrostatic fiberglass and washable/reusable filters, because they attract and capture the small, allergyaggravating microparticles that nonelectrostatic filters cant.Improves Indoor Air QualityWith indoor air a surprising two to five times more polluted than outdoor air, the 3M Ultra allergen reduction filter can make a difference in maintaining a healthier home environment by cleaning air with each pass through the filter.The 3M Ultra allergen reduction filter features a 1500 Microparticle Performance Rating (MPR), which means it is able to capture large and small particles from the air, including household dust, pollen, dustmite debris, mold spores, pet dander, smoke, smog, bacteria, and other allergens. This highperformance filter meets American Lung Association of the Upper Midwest Health House Programs indoor air quality guidelines.Improves EfficiencyThis highperformance allergenreduction filter also keeps your heating and air conditioning equipment working efficiently by removing dirt and reducing strain on the motor. It is recommended that you change the filter every three months. However, the effectiveness and life of the filter can vary and depend on the individual conditions in your home.About Filtrete Air FiltersFor nearly 25 years, Filtrete filters have delivered cleaner air to millions of homes, becoming a leader in residential air filtration. Developed by 3M engineers to help capture airborne allergens, the Filtrete filter media is electrostatically charged to act like tiny magnets to attract and capture microscopic particles from the air as it passes through the filter. Today, a dedicated technical team continues to develop innovative filtration solutions for around the home, including air cleaning filters, room air purifiers, and water filtration products.Whats in the BoxPack of four 3M 1500 MPR Ultra allergen reduction filters.Filtrete Air Filtration ProductsElite Allergen Reduction FilterUltimate Allergen Reduction FilterUltra Allergen Reduction FilterMicro Allergen Reduction FilterDust and Pollen Reduction FilterDust Reduction Filter MPR Rating 2200 1900 1500 1000 600 300 Dust Pollen Dust Mite Debris Lint Pet Dander Smoke & Smog Bacteria Particles Carrying Viru