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10", 30 Gauge, Hot Dip Galvanized Steel, 4-Piece, Round, Adjustable, Crimped, 90D, Sheet Metal Duct Elbow | Design Air
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6 Inch 90-Degree HVAC Elbow Duct - Galvanized 26 Gauge Adjustable Sheet Metal Elbow Duct Connector, Flexible Round Tube Air Ventilation & Fully Adjustable Vent Pipe HVAC Ductwork - Ducting Components - Amazon.com
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