14x24x1 MERV 13 (MPR 2200) AC Furnace Air Filters. Box of 6 ACTUAL SIZE: 13-3/8 x 23-3/8 x 3/4 | Nominal Size: 14x24x1 14x24x1 AC Furnace Air Filter MPR 2200 / MERV 13. Box of 6 Meets LEED Green Building criteria for minimum efficiency Industry applications: Filtration for Residential, 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