EZ-FLO 61604 Steel Floor Air Diffuser with Louvered Design with Grille Opening of 4-Inch x 12-Inch, Brown COLOR: Brown powder-coated smooth finish to give any home and office an updated look DIMENSIONS: Duct opening measurement: 4" x 12" Outer dimension measures 5-1/2 x 13-1/2 inches MATERIAL: The all steel construction makes this diffuser a long-lasting, durable choice DESIGN: This floor register has non-adjustable louvers and an adjustable damper; damper blades control airflow EASY INSTALLATION: The floor air vent register includes a kit of screws to make installation easy and efficient