I have a free standing wood burning stove that was in my house when I bought it. The knuckel head that installed it ran a piece of tile out through the wall and built a cinder block chimney,hollow on the inside no tile.I am no expert but I know that this is not safe. I had a guy come out two years ago and he gave me a price to fix it. I just about had a stroke. With the price of natural gas going through the roof I think that it is time to do something with it. Cash is tight, Columbia gas just jacked my rates and we won't talk about the bill that I got from AEP. I had thought about buying the double wall pipe from Lowes and installing it my self but I have not figured out how to tie it in at the bottom, no access. Any of you members do this kind of work? Any advice would be a big help. Thanks in advance.