Nordic Pure 20x25x5L1M13-1 20x25x5, MERV 13, Lennox X6673 Replacement Air Filter, Box of 1, 5-Inch Actual Size: 19 7/8 x 24 7/8 x 4 3/8 Comparable to a MPR rating of 2200 Superior Air Filter for Residential or Commercial Property Hypoallergenic and antimicrobial pleated electrostatic filter material Made in the USA