The Master Flow 10 in. x 4 in. x 4 in. Universal Register Box creates a straight (in-line) transition from round pipe or insulated flexible duct to an air register. It features 30-Gauge， galvanized steel construction. It has a maximum temperature rating of 390 degree F.
Made of 30-Gauge， galvanized steel
Creates a straight (in-line) transition from 4 in. round pipe or insulated flexible duct to a 10 in. x 4 in. air register
Always seal seams with building code-approved sealant or duct tape (not included)
Maximum temperature rating of 390 degree F， minimum temperature rating of 100 degree F
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