Master Flow 10 in. x 4

The Master Flow 10 in. x 4 in. x 8 in. universal register box is used to create a straight (in-line) transition from round pipe or insulated flexible duct to an air register or grille. It is made of 30-Gauge, galvanized steel to provide strength and durability. This universal register box can be installed with sheet-metal screws. Creates a straight transition from round pipes to grilles 30-gauge galvanized steel construction offers long-term use Easy to install with sheet-metal screws (not included) Made of 30-Gauge, galvanized steel for strength and durability Designed to create a straight (in-line) transition from 8 in. round pipe or insulated flexible duct to a 10 in. x 4 in. air register or grille Use sheet-metal screws for an easy installation (screws not included) Always seal seams with building code-approved sealant or duct tape (not included) Always insulate ductwork for greater system efficiency and comfort (insulation not included) Easily make a transition from round pipe or insulated flexible duct to a register by installing this excellent Master Flow Universal Register Box.