Nordic Pure 20x25x4 (3-5/8 Actual Depth) MERV 7 Plus Carbon AC Furnace Air Filter, Box of 1 Actual Size of Air Filter: 19 1/2 x 24 1/2 x 3 5/8 (19.5 x 24.5 x 3.63) inches MERV 7 is comparable to MPR 600 and FPR 5 All Nordic Pure air filters are electrostatically charged for maximum performance. Naturally derived charcoal media with activated carbon removes odors from VOCs, cooking, pets and smoke Attracts and captures dust, lint, pollen, dust mites and mold spores Made in the USA