Rumford Fireplaces
I put a link in another section about chimneys from the rumford fireplace site. Here is the link to the entire site. If your thinking you are going to build a fireplace you should look at this DESIGN (not endorsing the products). http://www.rumford.com/ This is the BEST heating fireplace design. you can also convert your modern no heat fireplace. Again I don't sell any products I am just familar with this design and a DIYer can do it. also very good info in the technical details section on radiant heat vs hot air. http://www.rumford.com/radiant/index.htm