Speedi-Grille SG-1212 FG 12-Inch by 12-Inch White Return Air Vent Filter Grille with Fixed Blades Speedi-Grille is made in the USA Holds a 11 50-Inch x 11 50-Inch up to a 2-Inch depth filter (Filter not included) Stamped 1/2-Inch fan shaped louvers Louvers are parallel to longest side Made in USA with Solid steel construction