Nordic Pure 18x24x1 MERV 14 Pleated AC Furnace Air Filters, Box of 12 Actual Size of Air Filter: 17 1/2 x 23 1/2 x 3/4 (17.5 x 23.5 x 0.75) inches MERV 14 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