8 in. x 4 in. to 5 in. Insulated Register Box
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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. Made of zinc-coated, 30 gauge-galvanized steel Pre-insulated no need to wrap 1 in. fiberglass insulation lining and vapor barrier helps absorb HVAC system noise and control condensation R4 insulating value Always seal seams with code approved mastic, sealant or duct tape Install with sheet metal screws