Not sure which Filtrete Filter to buy? Click here to view our help guide. Filtrete™ 20x25x4 MPR 1550 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 1550 and MERV 12 rating your AC filter will help pull and capture countless microparticles – such as pet dander smoke bacteria and up to 55% of virus airborne particles (1) – while letting cleaner air flow through. Your Filtrete™ Filter will also capture large particles including lint pollen 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 365 days. Note: For easy replacement reminders create a change countdown in the Filtrete™ Smart App. Simply use the app to scan the barcode on your filter’s packaging then choose 90 180 or 365 days for your replacement countdown. When the filter’s life is up you’ll get a notification to change your filter. The No. 1 Recommended HVAC Air Filter Brand (2) Filtrete’s™ Home Air Filters provide the breakthrough technology needed to change how we clean our air by filtering out particles both large and invisible to create a cleaner healthier home for ourselves and our families. Residential use only. (1) Based on airborne MS2 virus testing. Initial efficiency. (2) Based on the 2022 Ipsos US Brand Health Study of Residential HVAC Air Filters.