Nordic Pure 20x20x5, MERV 10, Lennox Replacement Air Filter, Box of 2 Actual Size: 19-7/8 x 24-7/8 x 4-3/8 Replacement filter for Lennox X6673 Electrostatic air filter captures dust, pollen, dust-mite debris, mold spores, pet dander, and smog Hypoallergenic and antimicrobial pleated electrostatic filter material Made in the USA