The Master Flow 12 in. x 6 in. x 6 in. Universal Register Box with Flange is made of galvanized steel. It creates a straight (in-line) transition from round pipe or insulated flexible duct to an air register or grille. The built-in flange helps to create a more secure installation by providing an area for register screws， Sheetrock frame or nails for joists. The flange creates the ability to install the box before dry walling.
30-Gauge， galvanized steel
Creates a straight (in-line) transition from 6 in. round pipe or insulated flexible duct to a 12 in. x 6 in. air register or grille
Built-in flange helps to create a more secure installation by providing an area for register screws， sheetrock frame or nails for joists
Flange creates the ability to install the box before dry walling
Maximum temperature rating of 390 degree F， minimum temperature rating of 100 degree F
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