The Field Controls GVD-5PL Vent Damper is a gas-powered central furnace accessory made of stainless steel. It is designed for a nominal duct diameter of 5 inches and features a dynamic damper type. The damper has dimensions of 6-1/16 inches in length, 9-7/8 inches in height, and 6-1/8 inches in overall width. It is compatible with Field Controls brand products and comes with a 1-year manufacturer warranty. This vent damper is ideal for controlling air flow in furnace heating systems, specifically for duct shape not applicable.