15x20x1 Filtrete Filter, Case of 6

15" x 20", Purple, Ultra Allergen Filtrete Filter, The Filtrete Ultra Allergen Filter Outperforms All Other 1" Filters, 90% Effective At Capturing Large Allergens Like Mold & Pet Dander, Electrostatically Charged, Captures Micro Allergens Like Dust & Smoke, Also Captures Bacteria & Particles That Can Carry Viruses, MPR Rating 1500, Lasts Up To 3 Months.