... with Fiberglass for (A/C) Air Conditioner System The Biggest Manufacturer in China (Air Ducting,Insulated & Non-insulated Air Flexible Duct & Silent Insulated Duct ... , theater, factory...) high requietment of the enviroment area, such as hospital, laboratory, howff, bus, train, broadcasting studio.PROPERTIESVALUEDiameter Range75-750mm (3 ...