[john70t]

I don't know much about fireplaces, but several things I'd be warry of them is:
1). Coal and gummy wood, like pine, leave more creosote in the flue, which build up and can cause fire.
2). You might want to retrofit to a double-flue, a tube inside a tube. The outer tube draws in fresh air for combustion in case there are leaks in the inner tube. Caveate:I'm not sure these are used with woood burners or not.
3). There might be standards for flue diameter. Too big/high, and the stack won't pull. Too small and the firepit will back up.
4). Kindling first to build heat and prewarm the flue while the bigger pieces are drying out nearbye.
5). CO meters and fire extinguishers are a must.

This is for info only, check with a proffessional.