Filtrete 20x20x1 MPR 2800 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 2800 and MERV 14 rating, your AC filter will help pull and capture countless microparticles and ultrafine particles – such as pet dander, smoke, bacteria and viruses – while letting cleaner air flow through. This HVAC filter captures up to 81% of small particles (1) and 93% of airborne virus particles (2) to help make your air cleaner. Your Filtrete Filter will also capture large particles, including lint, pollen and household dust. This filter is CERTIFIED asthma and allergy-friendly (3). Use this 2-pack of 3-month pleated 1-inch home air filters in your furnace, air conditioner or HVAC system. Change your furnace filter at least every 90 days. (1) Percent captured is based on ASHRAE 52.2 testing for 0.3 to 1 micron particles from the air passing through the filter, which relates to HVAC industry standard efficiency testing. (2) Based on airborne M2 virus testing. Initial efficiency. (3) As outlined in report ASCR: 1246-01. (4) Based on the 2022 Ipsos US Brand Health Study of Residential HVAC Air Filters.