Nominal Size: 10 x 24 x 1, Actual Size: 9 1/2 x 23 1/2 x 3/4 (9.5 x 23.5 x 0.75) Measure your air filter for the exact size and compare it to our actual size to ensure proper fit. Ideal for normal air filtration and will help those with mild allergies. Nordic Pure MERV 10 is equivalent to MPR 1000 Made in the USA