Tier1 Replacement for 16x25x1 Merv 13 Ultimate Air Filter/Furnace Filter 6 Pack Similar to the 3M Filtrete Healthy Living Ultimate Allergen 16x25x1 Air Filter Made in the U.S.A. Actual Size: 15 1/2 inches (length) x 24 1/2 inches (width) x 3/4 inches (thickness) Electrostatically charged filter media Fits heating / air-conditioning systems that use 1-inch replacement filters