I am installing a new wood insert into my chimney that had a very old insert in it before. I want to do the installation correct. What parts am I going to need. How far up the chimney do I need to go with my stainless 6" pipe. I understand there is a kit to run the pipe through that seals off whwere the old damper was. Where is a good place to purchase this. Any help on the installation would be helpful. Thanks