Nordic Pure 18x24x4 MERV 15 Air Condition Furnace Filter, Qty 1 Actual Size of Air Filter: 17 1/2 x 23 3/8 x 3 5/8 (17.5 x 23.38 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 Attracts and captures dust, lint, pollen, bacteria, pet dander, dust mites, mold spores, smoke particles, smog, viruses, coughs and sneezes Made in the USA