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