Amazon.com The Filtrete 300 MPR dust 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, and other large-particle contaminants to keep surfaces in your home clean and dust-free longer. With each pass through the specially pleated filter, the air in your living space improves, making for a healthier home environment. This high-performance filter outperforms comparable non-electrostatic fiberglass and washable and reusable one-inch filters. Electrostatic Design Captures More Particles The 3M dust reduction filter is made with both positively charged and negatively charged fibers that act like tiny magnets to attract air-polluting 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 dust reduction filter, perform better than comparable non-electrostatic fiberglass and washable/reusable filters, because they attract and capture the small, allergy-aggravating microparticles that non-electrostatic filters can't. Improves Indoor Air Quality With indoor air a surprising two to five times more polluted than outdoor air, the 3M dust reduction filter can make a difference in maintaining a healthier home environment by cleaning air with each pass through the filter. Ideal for capturing large particles from the air, including household dust and pollen, the 3M dust reduction filter features a 300 Microparticle Performance Rating (MPR). Improves Efficiency This dust reduction 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 Filters For 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. What's in the Box Pack of six 3M 300 MPR dust reduction filters. Product Description Filtrete 20x25x1 MPR 300 Air Filter, made by 3M, helps capture unwanted particles from your household air to contribute to a cleaner, fresher home environment. Designed with exclusive Filtrete 3-in-1 technology, including an MPR 300 and MERV 5 rating, your AC filter will help pull and capture lint, household dust and dust mite debris, while letting cleaner air flow through. This 20x25x1 air filter outperforms fiberglass, washable and non-electrostatic air filters to help keep your air cleaner. Use a 3-month pleated 1-inch home HVAC filter in your furnace, air conditioner or HVAC system. Six come in a pack, so keep a few filters as backup, or use them in multiple areas. For optimal performance of your heating and cooling system or HVAC system, change your furnace filter at least every 90 days. (1) Based on the 2022 Ipsos US Brand Health Study of Residential HVAC Air Filters.