Nordic Pure 18x24x4 MERV 10 Pleated AC Furnace Air Filter, Box of 2 Actual Size of Filter: 17-3/8 x 23-3/8 x 3-3/4 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