Nominal Size: 16 x 25 x 1, Actual Size: 15 1/2 x 24 1/2 x 3/4 (15.5 x 24.5 x 0.75) Measure your air filter for the exact size and compare it to our actual size to ensure proper fit. Two beneficial air filters in one - MERV rated synthetic poly blend activated carbon infused pleated media Nordic Pure recommends changing 1" air filters every 30-90 days Made in the USA: Proudly manufactured in the USA, ensuring quality and supporting local production Ideal for customers who not only need odor control but whose daily life demands high filtration, including lint, dust, pollen, pet dander, and smoke particles.