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R6 R8 Flexible Duct HVAC Fiberglass Insulated Flexible Double Helix Insulation Air Duct, Find Details and Price about Ventilation Duct Insulated Flexible Air Duct from R6 R8 Flexible Duct HVAC Fiberglass Insulated Flexible Double Helix Insulation Air Duct - Suzhou Daco Static Wind Pipe Co., Ltd.