Nordic Pure 16x20x4M11 16-Inch by 20-Inch by 4-Inch MERV 11 AC Furnace Air Filter, 6-Piece Actual Size of Air Filter:15 1/2x19 1/2x3 5/8 Electrostatic air filter captures dust, pollen dust-mite debris, mold spores, pet dander, and smog Outperforms comparable fiberglass, washable, and poly disposable filters Hypoallergenic and antimicrobial pleated electrostatic filter material Made in the USA