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Vent Systems 8" inch to 4" inch Duct Reducer Adapter Connector Fitting Pipe Increaser Reducer Cone for HVAC, Ventilation Systems, Exhausts and Grow Tents. (Galvanized Steel, 200 to 100 mm) - Amazon.com
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IMPERIAL 6-in Galvanized Steel 90 Degree Round To Oval Duct Boot in the Duct Transitions & Connectors department at Lowes.com
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