Master Flow 12 in. x 6 in. to 8 in. Universal Register Box with Flange

The Master Flow 12 in. x 6 in. x 8 in. Register Box with Flange is designed for 8 in. round ducts. This 30-Gauge register box with flange is made of zinc-coated galvanized steel. The maximum temperature rating is up to 390° F and the minimum temperature rating is as low as -100°F.