Reduced chimney draft seemed to come with a a low pressure front often accompanied by Spring and Fall rain. I’d been believing that that it was not just temperature that had an affect but also pressure. Seeing no references to atmospheric pressure in my short time here it seems I had it wrong. I’m now wondering if it is just warmer temps that may come with the lows. Does a falling barometer have no affect?
Barometric pressure on draft?
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It's been discussed before and I don't know if a firm conclusion was reached. I think the influence is small when compared to outside temps or wind. It seems like the barometric pressure outside is about the same as inside unless measured in a negative pressure zone like the basement.
It's the pressure difference between bottom and top of the stack that matters. The lower absolute pressure (decreasing with a low pressure front) will decrease the draft but it is a relatively minor effect as compared to the temperature difference that creates the draft.
Perhaps lower atmospheric pressure is like running the stove at a higher altitude which is known to reduce draft.
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