Roof Vent Kit, For Use With Heating and Cooling Systems, Includes (2) 4 in Clamps, 4 in Diameter Metal Duct Connector, 4 to 3 in Reducer, 8 ft Long x 4 in Diameter Flexible Metal Ducting, Mfr. No. 636 Roof Jack for 3 and 4 in Ducts
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