Copper Tube, Heat Exchanger, Condensing Unit manufacturer / supplier in China, offering HVAC Ventilation System Ducting Bend 90 Degree Connector Stainless Steel Elbow Bend Spiral Ducting Bend, White PE Insulation Copper Pipe Linesets Insulated Copper Tube Factory-Direct Bendable 1/4 3/8-Inch Pure Copper Tubes, Ventilation Wall Duct Outdoor Air Conditioning Outlet Adjust Aluminium Disc Valve Circular Hood HVAC Round Air Vent for HVAC and so on.