Speedi-Grille SG-2520 FG 25-Inch x 20-Inch White Return Air Vent Filter Grille with Fixed Blades Speedy-Grille is made in the USA Holds a 24.50-Inch x 19.50-Inch up to a 2-Inch depth filter (not included) Stamped 1/2-Inch fan shaped louvers Louvers are parallel to longest side Made in USA with Solid steel construction