Spin-in Round Collar with Damper
This spin-in round start collar with damper is for transition from flat surface to round pipe or insulated flex duct with damper for flow control. Spin-in designed for easy installation. It is available in size from 3” to 20”, and it is made of 26 gauge galvanized sheet metal up to 12″ or 24 gauge galvanized sheet metal from 14″ to 24″.
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