After installing the 44 elite; I have problems with sufficient draft and smoke entering the room. The local installer suggested insulation of the walls of the chimney system (chase). However, the elite has a cooling duct system that draws cold air from the outside and circulates it within the walls of the unit and up within the chimney's triple wall flu. The idea being the unit would get too hot near combustible material if not cooled with outside air. I'm asking then... does it make since to insulate the walls of the chimney system (chase) when the unit itself seems to be fighting overheating? Note, I working off logic, perhaps there is more to the story?