Speedi-Grille SG-2016 FG 20-Inch by 16-Inch White Return Air Vent Filter Grille with Fixed Blades Speedi-Grille is made in the USA Holds a 19 50-Inch x 15 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