Nordic Pure 24x24x4 MERV 10 Pleated AC Furnace Air Filter,  Box of 1 Actual Size of Filter: 23 3/8 x 23 3/8 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