We has successfully developed a new structure which completely no cold-bridge,the structure mainly used in ceiling air handler,to solve the existing problem of condensation in ceiling air handler,the product structure has obtain a patent,patent no:2006200654232. The new structure has now been successfully used in food industry,commercial building and electronic factories,and has been highly appreciated by users.The new structure has excellent features such as graceful appearance,lightweight,small leakage rate,clean and security.