Filtrete 20x20x1 MPR 1200 Air Filter, made by 3M, helps minimize strong odors and capture unwanted particles and allergens from your household air to contribute to a cleaner, fresher home environment. Designed with exclusive Filtrete 3-in-1 technology with a unique active carbon layer that captures odor particles, plus an MPR 1200 and MERV 11 rating, your AC filter will help pull and capture countless microparticles - such as pet dander, smoke, smog, odors, and cough and sneeze debris - while letting cleaner air flow through. Your Filtrete Filter will also capture large particles, including lint, pollen, mold spores and household dust. Use a 3-month pleated 1-inch home HVAC filter in your furnace, air conditioner or HVAC system. Three come in a pack, so keep one filter as backup, or use them in multiple areas. For optimal performance of your heating and cooling system or HVAC system, cha