Nordic Pure 18x24x4 (3 5/8) Pleated Air Filters MERV 7 Plus Carbon 6 Pack

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) 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 4" air filters every 3-6 months Made in the USA: Proudly manufactured in the USA, ensuring quality and supporting local production Improved filtration captures dust, pollen, and lint, providing better indoor air quality for homes and offices. The Plus Carbon enhances odor control and fresher indoor air.