Transform your home into a sanctuary of clean air with the Filtrete 20x25x4 Air Filter MERV 11 - 4-Pack Micro Allergen Defense. Manufactured by 3M, this advanced air filter is designed to effectively capture a wide range of unwanted particles, ensuring that the air you breathe is fresh and free from allergens. Utilizing exclusive Filtrete 3-in-1 technology, this filter boasts an impressive MPR 1000 and MERV 11 rating, which means it can trap up to 2X more microparticles compared to standard MERV filters. Say goodbye to pet dander, smoke, smog, and other harmful pollutants, while allowing cleaner air to flow through your HVAC system.