BeGreen said:If it is he's going to need a royal flush to clear the pipes or he'll end up with a full house. %-P
BeGreen said:If you look at how a good masonry stove is designed, there are often several passages where the smoke goes downward. This wouldn't work well in a flue that had neutral or negative draft, but should be ok with a flue that has strong natural draft. I saw low exit kachelovens in Europe too. It's counter-intuitive, but they seem to work well.
KWillets said:Having the flue outlet below the inlet was a puzzler for me, but I realized that incoming gas at, say, 1500 F can push 500 F gas out of a level or lower vent pretty easily. One problem is that the flue pressure has to be positive for this to happen, at least to start ( a stack after the outlet can produce a net draft, but it has to be warmed up first).
As I understand it, the firebox has to have a short vertical draft into a "heat exchanger" area where flue gas cools significantly, loses buoyancy, and is then pushed down through a lower exit. The short, hot draft from the firebox is enough to overcome the buoyancy of the cooler, deeper exit path.
One unexpected result is that startup should have a better draft than when the exit temperature is higher.
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