That makes sense that one as to be able to get into it, and to have enough heat to drive it up the chimney. I don't think my landlord would care for me punching a huge hole in the wall, especially when there's a great big chimney in the middle of the building already. But it does go up a good 15-17 feet, if not more. Will that be a problem? Will I lose too much of my heat up the chimney? And how does one make a pipe inside a cob bench accessible, even if it's straight?
The fire inspector has never been by, so I'm not worried about that. Our insurance guy probably won't love it, but he's also pretty relaxed and has never inspected anything. We have massive open flames all the time anyway.