Nordic Pure 16x25x4M8-1 MERV 8 Pleated AC Furnace Air Filter, 16x25x4, Box of 1 The actual size : 15-1/2 x 24-1/2 x 3-5/8 of a filter is fraction of an inch smaller than the nominal size Electrostatic filter captures large airborne particles like household dust, mold spores, and pollen Outperforms comparable fiberglass, washable and disposable filters Hypoallergenic and antimicrobial pleated electrostatical filter material Made in the USA