The Master Flow 8 in. x 4 in. x 5 in. Tall Insulated Register Box with End Outlet is lined with duct liner giving the box an R-Value of 4. It 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 installation. The insulation also serves as a noise deadener and helps control condensation. It is designed for 5 in. round ducts. This 30 gauge register box with flange is made of zinc-coated galvanized steel.
Made of zinc-coated galvanized steel
Designed for 5 in. ducts
30 gauge
R value 4
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