I have a question of smoke/fire door inspections. In many training conferences and training videos a picture is shown with a fire/smoke door decorated with wrapping paper. The caption usually reads "this is not allowed." My question is... where is this stated in the code? Secondly, if it is in the code does it refer to the testing method used to determine this light weight, fast burning material is going to effect the door rating? Or has this become an accepted practice by inspectors for siteing under "altering the fire door?"