Nominal Size: 16 x 25 x 3, Actual Size: 15 13/16 x 24 5/16 x 3 (15.81 x 24.31 x 3) Measure your air filter for the exact size and compare it to our actual size to ensure proper fit. Replaces Trion Air Bear Cub filters and others that require an actual 3" depth and ideal for customers looking for superior filtration Nordic Pure MERV 13 is equivalent to MPR 2200-2400 Made in the USA