Master Flow 12 in. x 4 in. to 6 in. Universal Register Box

Register Boxes create a straight (in-line) transition from round pipe or insulated flexible duct to an air register or grill. Available in an assortment of configurations. This particular item transitions from 12 in. X 4 in. register to a 6 in. pipe or flexible duct.|Galvanized steel construction|Always seal seams with building code approved sealant or duct tape|Install with sheet metal screws|Always insulate ductwork for greater system efficiency and comfort