8 in. x 4 in. to 5 in. Insulated Register Box

The Master Flow 8 in. x 4 in. x 5 in. Insulated Register Box is designed for durability. This register box is made of zinc-coated, 30-gauge galvanized steel. The 1 in. fiberglass insulation helps reduce HVAC system noise and absorb condensation for a quiet and efficient system. This register box can be installed with sheet metal screws.