20x25x1 MERV 13 ( MPR 2200 ) AC Furnace Air Filters. Box of 6 ACTUAL SIZE: 19-1/2 x 24-1/2 x 3/4. | NOMINAL SIZE: 20x25x1 | Box of 6 RATING: MPR 2200 / MERV 13 / FPR 10 | Meets LEED Green Building criteria for minimum efficiency Heavy Duty Beverage Board Frame - Moisture resistant, sturdy frame material stands up to rough handling, difficult service conditions, long service life. Industry applications: Pre-filtration for hospitals, general health care facilities, food processing plants, telecommunications, pharmaceutical and semi-conductor manufacturing, etc. Recommended to replace at least every 90 days. Made in the USA