The Master Flow 12 in. x 12 in. Universal Register Box with Flange is designed to be used with 8 in. ducts to create a straight transition from a round pipe or insulated flexible duct to an air register or grill. Made of zinc-coated， galvanized steel this register box is designed for durability. The built-in flange helps you install the box before dry walling.
Made of zinc-coated， 30-Gauge galvanized steel
Designed to create a straight transition for 8 in. round ducts or insulated flexible duct to an air register or grill
Built-in flange helps provide space for easy joist attachment before dry walling
Always seal seams with code approved mastic， sealant or duct tape
Features a minimum temperature rating of 100 degree F and a maximum temperature rating of 390 degree F
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