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Plastic Straight Duct Adaptor Connector Round Duct Reducer & Increaser Connecting Inline Fan Heating Cooling Ventilation Reducer - Vents - AliExpress
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10" to 5" Duct Reducer Round Reducer Duct Fitting Pipe Increaser Reducer Made From Galvanized Steel (Drain, Waste and Vent) Reducing Coupling (Metal, 10 to 5 Inch) - - Amazon.com
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