I had a lot of used brick and a wood stove. I'm having a new garage built so my existing garage is now going to be a workshop, hopefully with a lot more room to work, as long as I don't fill it up with more stuff. Anyway since there was already a slab adjacent to the garage I decided to attempt a brick chimney, even though I've never laid a brick in my life. First I put a 32" square slab with rebar up the center, then I laid brick up three feet and poured concrete down inside. Then from there added a cleanout door and started the 8"x8" clay flue. I think it looks ok but not a pro mason job for sure. The stove is from the 1970's I think. Atlanta Stove Works. The plan is to insulate part of the garage and just heat that but with a sliding door I can open to heat the rest. It was an interesting project, I learned a lot. My next chimney will be more neat and even. I used four different styles of old brick since I didn't have enough of one type for the entire chimney and hearth.