Nordic Pure 16x25x5L1M13-1 16x25x5, MERV 13, Lennox X6670 Replacement Air Filter, Box of 1, 5-Inch Actual Size: 15 3/4 x 24 3/4 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