I have a 1200 sq ft 1930's log cabin with a large traditional fireplace (brick chimney) positioned in the center of the cabin. On the back side of the fireplace, we have a very old potbelly stove that vents directly into the brick chimney. I'd like to replace this old stove with a new modern freestanding model and would like to vent it into the existing chimney. Unfortunatly, the stove and fireplace would share a single flue. Is this advisable? We have been operating the old stove and fireplace together without problems. We haven't had any problems with the draft. Is it possible to run a flue pipe for the new stove all the way up the inside of the chimney and still use the fireplace? The chimney is quite large. If that isn't a good idea, could we just continue to vent the new stove directly into the chimney. What problems would this create? For a number of reasons...(to many to list here)...it's not possible to run a new flue. Any advice would be greatly appreciated.