Adjustable Air Supply Grille for 14x6 Duct Opening, White, Steel Adjustable spaced fins. Primary use: Side wall and ceiling. Screws are included with the system, standard. All-steel construction. Durable white powder coated. Standard color is white (Ral9016). How To Measure A Grille Always measure the size of the duct opening (the 'hole' in the duct/wall). Do not measure the entire size of the register itself. Size of the grille is; listed size +1.75-inch. Understanding Width & Height In a grille size, the first number always represents the width and the second one is the height. As an Example: If the hole on your wall/duct is 14 inches wide by 6 inches tall, order 14x6 option.