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IMPERIAL 12-in Galvanized Steel Ductboard Duct Starting Collar in the Duct Transitions & Connectors department at Lowes.com
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Speedi-Collar SC-12 12-Inch Diameter Take Off Start Collar Without Damper for HVAC Duct Work Connections - Vents - Amazon.com
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Amazon.com: AC Infinity 4" Ducting Take-Off Collar, Galvanized Steel Inlet Flange Starter Collar for 4” Ducting with Dryers and Range Hoods : Industrial & Scientific
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Speedi-Collar SC-06D 6-Inch Diameter Take Off Start Collar with Damper for HVAC Duct Work Connections - Vents - Amazon.com
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