Nominal Size: 20 x 20 x 5 H, Actual Size: 19 5/8 x 19 7/8 x 4 3/8 (19.63 x 19.88 x 4.38) Measure your air filter for the exact size and compare it to our actual size to ensure proper fit. Replaces Honeywell 20x20x4 and filters with an MPR rating with an actual depth of 4 3/8 and ideal for superior filtration and odor control or commercial units Nordic Pure MERV 15+ is equivalent to MPR 2800 Made in the USA