Master Flow 10 in. W x 6 in. L to 7 in. Dia Universal Register Box with Flange

The Master Flow 10 in. x 6 in. x 7 in. Register Box with Flange is designed for 7 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.