Thanks for your reply and concern on this matter. By the way, do you know the industrial standard for window gap allowed? I need this to defense myself with my window co.
Are you saying you are trying to defend yourself for a mis-measured window? Most pro's will agree with what I have told you. However, there are companies that use 1/4 inch on each side in order to accomodate additional insulation. I don't know of any reputable company that allows 1/2 inch on each measurement. The idea is to do a custom fit and install.