10 in. x 4 in. to 4 in. Universal Register Box
Master Flow. $21.49. In stock.
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.
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