Nordic Pure 16x25x5, MERV 10, Lennox Replacement Air Filter, Box of 2 Actual Size: 15  x 24  x 4 3/8 Replacement Air Filter for Lennox 6670 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