Master Flow 8 in. x 4 in. R6 Duct Board Insulated Register Box

The Master Flow 8 in. x 4 in. Insulated Duct board Register Box helps connect a round pipe or insulated flexible duct to an air register or grill. This duct board is pre-insulated with R6 fiberglass insulation. The insulation helps to absorb condensation and noise for a quiet and efficient system. This register box has a minimum temperature rating of 100 degree F and a maximum temperature rating of 390 degree F.

• Transition from pipe or insulated flex duct to register grille
• Durable galvanized steel construction
• R6 ductboard insulation, no need to wrap