Nordic Pure 20x25x4 (3-5/8 Actual Depth) MERV 15 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 15 is comparable to MPR 2800 and FPR 10 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, bacteria, pet dander, dust mites, mold spores, smoke particles, smog, viruses, coughs and sneezes Made in the USA