Greg & I have been PM'ing each other in re my situation in which I don't see a benefit (for me) of a barometric damper. I had one years ago but never saw a benefit)
I have never noticed a time when my stove temp would actually increase
I'll post the questions that I asked Greg, that I just can't seem to wrap my brain (what's left of it
1.If the chimney's draw is increased due to occasional wind gusts, wouldn't that draw be pretty effectively limited by the amount of air I'm giving the fire at the stove's air intake, unless we are talking hurricane force winds?
2. Wouldn't a baro damper work the same if connected to the outside of the chimney (through a pipe run up from the exterior clean out door & run up into the flue) to even out pressure differences caused by wind gusts, but do so without wasting stove warmed interior air & drawing cold air into the house to replace it? (the outside baro damper would have to be plastic to avoid rusting...Like a clothes drier vent.)Physics Thinking:Situation:
No wind...32* outside air temp.
1. I start my stove & open my air vent 2 notches...stove temp 220*
Change in Situation: An hour later, the wind is howling outside, (across the top of the chimney) causing more draft (lower pressure in the chimney) & therefore, sucking more air through the coal fire. (I would assume that stove temp would rise a bit & coal usage increase....but I have never noticed this happening to me)
For those whose stove does increase in temp, If you introduce a baro damper into this equation (to dampen any internal chimney pressure changes by introducing more air into the flue) wouldn't it work the same way whether it's located inside (near the stove) or outside on he chimney itself? (but outside it would not be wasting stove warmed interior air)
I just have a natural aversion to seeing stove warmed air sucked out of the house & wasted up the chimney, for no visible benefit to me.
(what am I missing/not understanding?)
Possible reason for my seeing no difference: After 26 years of use , I'm sure my chimney is not air tight & wind gust variations may be drawing outside air into the chimney through cracks & air infiltration around the clean out door
EditL: How about this experiment: (seal your damper closed, if you have one)
1. Take a large fan & tie it to the top of your chimney so that it's blowing across the top to simulate high winds.
2. Set you stove to maintain a constant temp
3. Turn on the fan & watch the stove temp
What should you see?
Stove temp increase?...Open Baro damper........ Return to the original temp? Maintain the higher temp?
how about if you introduce an exterior baro?...any difference over an interior one?