Nordic Pure 18x18x1M12-12 MERV12 AC Furnace Air Filter, Box of 12 Actual Size of Air Filter: 17 3/4 x 17 3/4 x 3/4 (17.75 x 17.75 x 0.75) inches MERV 12 is comparable to MPR 1500, 1900, and FPR 9 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 and viruses Made in the USA