I have an existing wood stove that the flue pipe (8") goes straight
back from the stove into a brick wall then up into the chimney. The
chimney flue is stainless and is 8" all the way up. The woodstove is
in the basement and the dedicated chimney is 3 full stories above it.
I have always had a very good draw from this setup. I would like to
upgrade my woodstove to a new Jotul. Unfortunately, the flue pipe is
only about 18" above the base of the woodstove and most woodstoves
with a rear flue are several inches above that. I understand that its
desirable (or is it in the code?) that the flue pipe from the
woodstove to the chimney should slope upward. Is this mandatory.
Since I have such a good draw, and I'll have to use an adapter (8" to
6") anyway which will help the draw to the woodstove. Under these
circumstances, can I use a modern woodstove that has a higher exhaust
flue than the input to the chimney? I'm probably not using the
correct terminology I realize, so let me explain it this way. The
current flue pipe is parallel to the floor. If I install a new stove,
the pipe will slope downward from the woodstove to the chimney pipe
for about 24 inches. Will this be ok?
No. You cannot avoid creosote. The point is that
creosote will be concentrated at any low spot
between the stove and the vertical flue, hugely
increasing the frequency of chimney fires.
You can disassemble the pipes for cleaning,
so you might get away with a low spot if you
clean the pipes frequently. (Weekly? Monthly?)
Carlsbad Springs (Ottawa, Canada)
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