Not sure which Filtrete Filter to buy? Click here to view our help guide. Filtrete 16x25x4 MPR 1000 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 1000 and MERV 11 rating your AC filter will help pull and capture countless microparticles ? such as pet dander smoke and smog ? while letting cleaner air flow through. Your Filtrete Filter will also capture large particles including lint pollen mold spores and household dust. Use a 12-month pleated 4-inch 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. (1) Based on the 2022 Ipsos US Brand Health Study of Residential HVAC Air Filters.