18x22x1 MERV 13 (MPR 2200) Pleated AC Furnace Air Filters. Box of 6 18x22x1 MERV 13 (MPR 2200) Pleated AC Furnace Air Filters. Box of 6 Actual Size: 17-3/8 x 21-1/2 x 3/4. Meets LEED Green Building criteria for minimum efficiency Protects from pollen, dirt, dust, pet dander and virus carriers, smoke, smog, lead dust, oil smoke and micro allergens. Made in the USA