Nominal Size: 20 x 25 x 5 AB, Actual Size: 19 3/4 x 24 1/4 x 4 7/8 (19.75 x 24.25 x 4.88) Measure your air filter for the exact size and compare it to our actual size to ensure proper fit. Trion Air Bear Replacement filters have a depth of 4 7/8" and ideal for normal air filtration Nordic Pure MERV 10 is equivalent to MPR 1000 Made in the USA