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 high efficiency air filtration and those with moderate allergies Nordic Pure MERV 12 is equivalent to MPR 1500-1900 Made in the USA