Master Flow 12 in. x 4 in. to 6 in. 90-Degree Register Box

The Master Flow 12 in. x 4 in. x 6 in. 90 Register Box is designed for 6 in. round ducts. This 30-Gauge register box is made of zinc-coated galvanized steel. This register box has a maximum temperature rating of up to 390F and a minimum temperature of as low as -100 degree F.|Made of zinc-coated galvanized steel|Designed for 6 in. round ducts|30-Gauge|Features a minimum temperature rating of -100 degree F and a maximum temperature rating of 390 degree F|6 in. D x 9 in. L