20x24x1 MERV 13 (MPR 2200) Pleated AC Furnace Air Filters. Box of 6 ACTUAL SIZE: 19-3/8 x 23-3/8 x 3/4. NOMINAL SIZE: 20x24x1 MERV 13 (MPR 2200) Pleated AC Furnace Air Filters. 6 PACK | Meets LEED Green Building criteria for minimum efficiency Low initial resistance also helps to promote low energy consumption Protects from pollen, dirt, dust, pet dander and virus carriers, smoke, smog, lead dust, oil smoke and micro allergens. Made in the USA