23x22x5 (22.5x22x5.25) MERV 13 Aftermarket Nordyne Replacement Filter (2 Pack) Nordyne filter models 918759, MAH-1056C. 23" x 22" x 5" (nominal size) | Actual size (H)22 1/2" x (W)22" x (D)5 1/4". Original box type design. Removes atmospheric and household dust, coal and insecticide dust, mites, pollen, tobacco smoke, cooking smoke, grease, mold, fungi and more down to 0.3 micron. This is an aftermarket filter.