I don't know if I can do this but I have a gas fireplace and I would like to buy a wood stove and run the flu into the gas pipe. I'm looking at the the Jotul f 100 (broken link removed to http://www.jotul.com/en-US/wwwjotulus/Main-menu/Products/Wood/Wood-stoves/Jotul-F-100-Nordic-QT/) for its small size and height. The pipe on the fireplace is 10 inches if memory serves me right so its very big. can I run my flu into and just attach it there and seal it or can I run the 6" pipe up the existing pipe halfway or all the way to the top. Sorry I don't know much about this stuff.