Nordic Pure 20x20x4M12-2 AC Furnace Air Filters MERV 12, Box of 2 Nominal Size: 20-Inch by 20-Inch by 4-Inch Actual Size of Filter: 19 1/2 x 19 1/2 x 3 5/8 (19.5x19.5x3.63) MERV 12 filter media to help reduce pollen, pet dander, dust, mold and more Proudly Made in the USA Convenient home delivery