Filtrete⢠Allergens & Pet Dander Air Filter 1000 MPR NADP03-2IN-4, 20 in x 25 in x 2 in (50.8 cm x 63.5 cm x 5 cm). The Filtrete(TM) Allergen Defense filter attracts and captures microscopic allergens like dust, smoke, and smog particles and large allergens like mold spores and pollen.