This size fits standard duct opening of 12”x12" The air return vent is provided with a 1/4" overall frame/lip to provide stability as a drop down into the duct opening FACEPLATE SPECIFICATIONS: Metal Type: Sand Cast Aluminum Metal Face Plate Overall size: 14"x14" Face Plate Thickness: 1/4" HANDMADE BY SKILLED ARTISANS Industrial Design Patent Pending 196854 RUST FREE METAL: Is powder-coated in Fine Grain Matte Finish, easy to clean with a soft brush, and maybe repainted with metallic spray paint in the color of your choice DESIGN COVERAGE / EMPTY AREA RATIO : Makes the optimum use of coverage across the grate for durability, delivering adequate flow of heated or cooled air from the air duct. RECYCLABLE AND SUSTAINABLE MATERIAL INSTALLATION: Indoor: Floor; Wall For Floor: Select Grills without holes For Wall installation: Select Registers with countersunk holes (provided with matching mounting screws) Warning: California's Proposition 65