Nordic Pure 20x20x5 (4-3/8 Actual Depth) Honeywell Replacement MERV 8 Pleated AC Furnace Air Filter, Box of 2 Actual Size: 19-5/8 x 19-7/8 x 4-3/8 High Quality air filter for your Lennox unit Outperforms comparable fiberglass and washable filters Hypoallergenic and antimicrobial pleated electrostatical filter material Made in the USA