The Master Flow 8 in. x 4 in. x 4 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 6 in. round ducts. The built in flange can be used with Snap on Rails to make installation easier.
Made of zinc-coated galvanized steel
Designed for 4 in. ducts
30-Gauge
R-Value 6.0
Seal seams with code-approved mastic， sealant or duct tape (sold separately)
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