3M 9842DC-6 Filtrete 1000 Micro Allergen Defense Filter, 12 x 30 x 1 Filter measures 12x 30x 1 Effectively reduces allergens and microscopic particles in your home's air Captures airborne micro particles like smoke; airborne allergens like pollen, pet dander, mold and bacteria; and large particles like dust and lint Offers your home up to 3 months of filtering Meets the strict standards of American lung association's Health house project