Nominal Size: 15 x 20 x 1, Actual Size: 14 1/2 x 19 1/2 x 3/4 (14.5 x 19.5 x 0.75) Measure your air filter for the exact size and compare it to our actual size to ensure proper fit. Ideal for customers with health problems or for commercial units which support a rating of MERV 14 and above Nordic Pure MERV 14 is equivalent to MPR 2800 Made in the USA