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Nominal Size: 18 x 24 x 4, Actual Size: 17 1/2 x 23 3/8 x 3 5/8 (17.5 x 23.38 x 3.63)*Absorb smells from pets, smoking, cooking and other household odors*Ideal for customers looking for superior filtration and odor control*Nordic Pure recommends changing 4" air filters every 3-6 months*Made in the USA!