Our building has a fireplace, and we are planning on moving it a meter or two, however, we are strongly against making another hole in the roof of the building. Would it be possible/safe to run the chimney from the new fireplace at an angle and out the original hole in the roof? If so, what is the greatest angle that would be safe? Would there be any likely downsides to doing this? Any responses would be greatly appreciated. Thanks in advance!