Nordic Pure 18x20x1 Pure Baking Soda Odor Deodorizing Pleated AC Furnace Air Filters, Box of 3 Actual Size of Air Filter: 17 1/2 x 19 1/2 x 3/4 (17.5 x 19.5 x 0.75) inches Natural, eco-friendly baking soda media with no added fragrances or chemicals All Nordic Pure air filters are electrostatically charged for maximum performance MERV 8 media traps strong smells, allergens, dust, mold spores, pollen and pet dander Made in the USA