<font face="Verdana, Arial" size="2">Originally posted by fahnoe:
The basement fireplace had the same opening, just a taller chimney, so I figured I could either add height to the chimney (expensive) or reduce the aperature with a set of doors (less expensive). The addition of doors solved my problem: even when they're open, the frame reduces the opening enough to draw properly.
Interesting comments, but from my experience it goes even further. In my basement I have a wood burning stove with two cast iron doors. All performs well, and it will draw perfectly with the doors open for the first couple of hours or so. When the chimney reaches operating temperature there is a hugh reduction in the draft effect and you can have wisps of smoke coming out into the room with both doors open. Close one door and it will operate with out smoking again. But, to return to the same draft effect that was there upon start-up (everything cold) you need one door closed and the other just cracked open. Have been told that in industry a similar thing happens to their boilers, so it looks to me like the chimney height is not the only consideration effecting the draft available.