Insulated Flexible Aluminum Air Duct, High Temperature Insulated Flexible Duct, Flexible PVC Air HVAC Insulated Duct manufacturer / supplier in China, offering Insulated Flexible Ducting for Ventilation (HH-C), Multiply Aluminum Foil Flexible Hose (2"~20"), High Flexible and Compressible Aluminum Foil Duct and so on.