I recently hired a contractor who sold me an Osburn 2000 insert. He has been to my house a few times to install the stove and each time he said he had to come back. I am starting to question whether or not he is qualified and also very worried about safety. Today I saw the insert for the first time and without even measuring I could tell that it is too big to fit in the fireplace because of how the walls in the fireplace are tapered. His answer to this was that he can install it sticking out of the fireplace. If he does this, the stove will take up all but a few inches of the bottom part of the hearth. Would this be safe? Up to code in PA? Thanks!