EZ-FLO 61644 Steel Sidewall and Ceiling Return Air Filter Grille, 20" x 12" White FINISH: White Powder-Coated Smooth Finish quickly updates any room or office DIMENSIONS: Duct opening measures 20-inch x 12-inch, and the outer dimension measures 21-3/4-inch x 13-3/4-inch MATERIAL: All steel construction; high-impact, heavy-duty steel makes this air vent filter grille highly durable CONTENTS: This package includes a kit of screws to make installation easy and efficient EASY INSTALLATION: This return filter grille can be installed on the sidewall or ceiling without any hassle to ensure maximum airflow