EZ-FLO 61631 Steel Return Air Filter Grille for Sidewall and Ceiling Installation with Screws, 16" x 20" White FINISH: White Powder-Coated Smooth Finish quickly updates any room or office DIMENSIONS: Duct Opening: 16-inch x 20-inch sidewall or ceiling mount, The outer Dimension measures 18-11/16 x 22-11/16 inches 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