203502 3M Company 2016DC-6 16 x 16 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 House Program, MPR Rating 1500, Lasts Up To 3 Months.