Filtrete 16x20x4 MPR 1550 Air Filter made by 3M helps capture unwanted particles and allergens from your household air to contribute to a clean 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 viruses ? while letting cleaner air flow through. Your Filtrete Filter will also capture large particles including lint pollen and household dust. Use a 12-month deep-pleated 4-inch home HVAC filter in your compatible furnace air conditioner or HVAC system. For optimal performance of your HVAC system change your 4-inch furnace filter at least every 12 months. The No. 1 Recommended HVAC Air Filter Brand (1) Filtrete?s Home Air Filters help capture particles both large and invisible to create a cleaner healthier home.(1) Based on the 2022 Ipsos US Brand Health Study of Residential HVAC Air Filters.(2) Based on airborne M2 virus testi