Get your home feeling fresh and clean with Filtrete 14x25x1 MPR 1000 Air Filter by 3M. It uses exclusive Filtrete 3-in-1 technology, with an MPR 1000 and MERV 11 rating, to capture microparticles like pet dander, smoke, and smog while still letting air flow through. And don't worry about larger particles, like lint and pollen, because this filter has got you covered. Keep your HVAC system running smoothly by changing your furnace filter every 90 days, and with two filters in each pack, you can use one as a backup or switch it up in different areas of your home. Trust us, your air will thank you. (1) Based on the 2022 Ipsos US Brand Health Study of Residential HVAC Air Filters.