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. MERV rated synthetic poly blend pleated media plus activated charcoal flat panel added to increase odor control 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 High-efficiency filtration effectively reduces airborne contaminants, ideal for commercial spaces and sensitive environments.