Accord ABBBWH18 Baseboard Register with Sunburst Design, 18-Inch(Duct Opening Measurement), White Steel construction For floor application, 2-3/4-in projection 180 air deflection with a volume control damper Removable faceplate for easy installation and cleaning Actual length of item is 18-inches; inside duct opening measurement of item is 15-inches to accommodate the 1 -inch wide flanges on each end