18x24x1 Purple Filtrete Filter

18" x 24" x 1", Purple, Ultra Allergen Filtrete Pleated Filter, 3 Month Filter Is 90% Effective At Capturing Large Allergens Like Mold Spores & Pet Dander, Electrostatically Charged, Captures Microscopic Allergens Like Dust, Smoke & Smog, Captures Bacteria & Particles That Can Carry Viruses, Meets The Guidelines Of The American Lung Association Health HouseProgram, MPR Rating 1500, Lasts Up To 3 Months.