High Temperature Flexible Air Duct, Air Condition Duct, Insulation Air Duct manufacturer / supplier in China, offering Fire Retardant Flexible Duct Flame-Resistant PVC Negative Pressure Duct for Shipbuilding, High-Temperature Flexible Heater Duct -45º C to 300º C Resistant Industrial-Grade Ventilation, 100mm-1500mm PVC Spiral Industrial Flexible Air Duct Plastic Tubes and so on.