Master Flow Master Flow Central Air & Heat Components 12 in. x 6 in. to 7 in. Insulated Register Box with Flange R-6 IRBFR612X6X7
The Master Flow 12 in. x 6 in. x 7 in. Insulated Register Box with Flange provides a transition from round pipe or insulated flexible duct to air register or grill. It is insulated so there is no need to wrap after installations. The insulation also serves as a noise deadener and helps control condensation. It is designed for 7 in. round ducts. The built in flange can be used with Snap on Rails to make installation easier.