I have a ceramic insert firebox. We have never hooked up the piping, so it is unuseable. We want to put a pellet fireplace insert into the fireplace. The problem is the ceramic firebox is small and we don't have enough room for the pipe to come off the back of the insert. Can we put a hole in the ceramic firebox to run the pipe and then just go up through an open space (enclosed by walls) to the roof? Do you need a firebox for the insert and what purpose does the firebox serve. I hope I don't sound to stupid. Thanks Don