If you're looking to eliminate airborne allergens from your home, Filtrete micro-allergen reduction furnace filters by 3M have what you need. These highly efficient filters boast a Microparticle Performance Rating of 1000 to help catch allergens such as pet dander, smoke, and dust, and even larger allergens like dust and mould spores. 3M filters come in a variety of sizes to fit different central air and heating systems; this particular model measures 16 inches x 25 inches. For best results, change your filter every 3 months. For residential use only.