Filtrete 18x20x1, Allergen Defense Micro Particle Reduction HVAC Furnace Air Filter, 800 MPR, 4 Filters - Individually Wrapped, NEW Filtrete 18x20x1 MPR 800 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 800 and MERV 10 rating, your AC filter will help pull and capture countless particles – such as dust mite debris and mold spores – while letting cleaner air flow through. Your Filtrete Filter will also capture large particles, including lint, pollen, pet dander and household dust. Use a 3-month pleated 1-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 90 days. The NO. 1 Recommended HVAC Air Filter Brand, 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.