Filtrete? MPR 1550 Allergen, Bacteria & Virus 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 1550 and MERV 12 rating, your AC filter will help pull and capture countless microparticles ? such as pet dander, smoke, bacteria and up to 54% 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 12-month pleated 4"-6" 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 12 months. Note: For easy replacement reminders, create a change countdown in the Filtrete? Smart App. Simply use the app to scan the barcode on your filter?s packaging, then choose 90, 180 or 365 days for your replacement co