Master Flow 8 in. x 4 in. x 90 Degree Register Box with Flange

90-Degree Register Box with Flange creates a right-angle transition from round pipe or insulated flexible duct to an air register. This box is made of galvanized steel. It can be installed with sheet metal screws. It is suitable for most HVAC applications. Made of galvanized steel Creates a right-angle transition from 6 in. round pipe or insulated flexible duct to a 10 in. x 4 in. air register Install with sheet metal screws (not included) Always seal seams with code-approved mastic, sealant or duct tape (not included) Always insulate ductwork for greater system efficiency and comfort (insulation not included)