Nordic Pure 20x20x4 (3-5/8 Actual Depth) MERV 10 Pleated AC Furnace Air Filter, Box of 1 Actual Size of Filter: 19-1/2 x 19-1/2 x 3-5/8 Outperforms comparable fiberglass, washable, and poly disposable filters 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