Nominal Size: 20 x 25 x 4, Actual Size: 19 1/2 x 24 1/2 x 3 5/8 (19.5 x 24.5 x 3.63) Absorbs odors, VOCs and captures airborne particles from your indoor air. Improved pleated media provides 3 times the carbon media vs flat panel carbon filters. No messy, loose carbon particles with our carbon infused media. Made in the USA: Proudly manufactured in the USA, ensuring quality and supporting local production Activated carbon technology helps reduce indoor odors, smoke, and VOCs while capturing dust and allergens for fresher indoor air.