Filtrete MPR 2500 Premium Allergen and Ultrafine Particles 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 a high MPR 2500 and MERV 14 rating, your AC filter will help pull and capture countless microparticles such as pet dander, smoke, bacteria and up to 90 percent of virus airborne particles (1) while letting cleaner air flow through. Your Filtrete Filter will also capture large particles, including lint, pollen and household dust. Use a 3-month pleated 1-in. home HVAC filter in your furnace, air conditioner or HVAC system. For optimal performance of your heating and cooling system or HVAC system, change your furnace filter at least every 90 days. The No. 1 Recommended HVAC Air Filter Brand (2), Filtrete's Home Air Filters provide the breakthrough technology needed to change how we clean our air, by filtering out particles both large and invisible, to create a cleaner, healthier home for ourselves and our families.