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Flexible Ducting Diameter Fiberglass Double Helix Insulation Air Duct for HVAC System Ducting and Venting Insulation, Find Details and Price about Ventilation Duct Insulated Flexible Air Duct from Flexible Ducting Diameter Fiberglass Double Helix Insulation Air Duct for HVAC System Ducting and Venting Insulation - Suzhou Daco Static Wind Pipe Co., Ltd.