Truaire C154R 14X14(Duct Opening Measurements) Heavy Duty Floor Return Air Grille 14-Inch by 14-Inch Floor Return Air Grille, Brown Extremely ridged construction Model Size Indicates Duct Opening Measurements not Wall Opening Measurements. Over 75% free area High quality powder coated The actual face size is 15.8-inch in width and 15.8-inch in height.