Master Flow 12 in. x 4 in. to 5 in. 90-Degree Register Box

The Master Flow 12 in. x 4 in. to 5 in. 90-Degree Register Box is constructed from galvanized steel to help ensure a long-lasting performance. It creates a 90-degree transition from a round pipe or insulated flexible duct to an air register or grill. It is suitable for most HVAC applications and can be installed easily with sheet metal screws (sold separately).