Master Flow 12 in. x 4 in. to 6 in. 90-Degree Register Box
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The Master Flow 12 in. x 4 in. x 6 in. 90 Register Box is designed for 6 in. round ducts. This 30-Gauge register box is made of zinc-coated galvanized steel. This register box has a maximum temperature rating of up to 390F and a minimum temperature of as low as -100 degree F.