Filtrete 20x25x4 Slim Fit MPR 700 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 700 and MERV 8 rating, your AC filter will help pull and capture countless particles – such as pollen and pet dander – while letting cleaner air flow through. Your Filtrete Filter will also capture large particles, including lint, dust mite debris, mold spores and household dust. Use these 12-month pleated 4-inch home air filters 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 once per year. Fits systems calling for a filter thickness of 3.75" and larger. Filtrete Brand is North America’s most trusted brand of HVAC Filters. (1) Based on 2024 Sago US Brand Health Survey of Residential HVAC Air Filters (2) % 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.