The White 18"x18" Shoemaker 905 Series Vent Cover is designed to fit and cover an 18" wide by 18" high opening. Shoemaker has a complete line of products designed for homes, offices, stores, and many other commercial applications. The quality and simplicity of this Fixed Blade Grille are only two of the many reasons why Shoemaker Manufacturing leads the field in innovative air-grille design for real world applications. Shoemaker 905 Aluminum Airfoil Blade Grilles are designed to conceal duct-work while efficiently directing air flow in a forced air heating, cooling, or ventilation system. Typically the louvers on air grilles run the length of the grille and the many sizes of the grille vary to match the desired dimensions. Normally vents covers are mounted in walls but this can be mounted in ceilings as well. The Standard Color of this grille is white but optional Designer Colors in Satin Anodized Finish are available. The Shoemaker 905 Aluminum Airfoil Fixed Blade Grille can be ordered with heavy-duty tamper-proof screws for added security. Be sure to measure the hole opening size instead of measuring the face plate of your old grille. This grille is designed to fit over an 18"x18" existing hole or duct. Refer to the Specification Sheet for more information.