This is the special double insulated door I created while I'm testing the AC which is installed in the door way. Since I have not decided on the final AC size , type or location this allows me the option to make additional changes or modifications. In order for the AC to operate the side door just needs to be open approx 6"- 8" max. The blue foam on my cargo trailer door will be covered with another skin in the future. Stay tuned for more.