We are the manufacturer of flexible duct and flexible duct connector for air-conditioning and ventilation systems in China.We also produce acoustic panels,such as the grooved acoustic panel,perforated acoustic panel,cloth coating acoustic panel,diffuser absorption.As the flexible duct,we have insulated and uninsulated flexible duct,supporting 4 inch to 14 inch,the standard length is 10m.As the flexible duct connector,we have 1)silicone rubber connector(WKY),it can stand high temperature from -70C to 300C. 2)rubber connector(WKP),it's working temperature is from -30C to 70C. 3)canvas connector(WKD),working temperature is normal temperature. Should any items be of interested to you,pls don't hesitate to contact me. Contact:Clarisa Email:clarisa@zgjitai.com MSN:jally0909@hotmail.com Mobile:86-13570002229 http://www.zgjitai.com