Eco-Aire 21 1/2x23 3/8x1 MERV 8, Pleated Air Filter, 21 1/2 x 23 3/8 x 1, Box of 6, Made in the USA Nominal: 21 1/2x23 3/8x1 or (21 1/2 x 23 3/8 x 1), Size: 21 1/2"x23 3/8"x3/4", AC Furnace Air Filter Made in the USA Ships Directly in Factory Packaging Designed to last up to 60 Days Comparable to Filtrete Brand Filters