Summer smell from stove

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Eman85

Minister of Fire
Oct 10, 2022
1,464
E TN
We had extreme heat in the past week or so with temps to 100 and humidity very high. When the temps got up the stove was giving off a smoke smell, never had this before. The bypass damper was closed but it is a metal chimney through a metal roof and in direct sun. chimney was cleaned late in the burning season and I'm not going up there in this heat. Anyone else get smokey smell in high heat?
 
With AC on there may be a slight negative pressure in the room. This can also happen if the majority of the flue is in the cooler house envelope. The stove bypass will not block the air descending the flue in this case.
 
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Yes, I had this regularly - but a basement stove so more chance of negative pressure - especially when it's humid outside, not only when it's hot, but also when it's 50 F and humid here.

My stove pipe is off the stove in summer, and the flue (thimble) capped. Yet that cap was not air tight and that is already enough to stink up the basement.
So I used an old t-shirt as a seal/gasket this spring, and I no longer have the smells.

So, yes, tiny, tiny cracks in any seal can get you quite a good smell if the conditions (flue and home pressure) are right (or, better, wrong...).
 
This stove and chimney has been exactly the same for many years now, first time I've ever had smell like this. AC was definitely running and when I opened the stove top and the bypass damper you could really feel it pulling the heat. Still hot today high 80's low 90's and no smell.
 
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Mid 90's and no smell but I took a look and the air intake was wide open, maybe a factor, I closed it and I'll hope it doesn't get as hot in the coming weeks.
 
If it gets bad you can stuff an old towel in the flue. I do that sometimes. Just leave a note in the stove reminding you to remove it before burning.
 
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I’ll usually get the smell when conditions are just right or an exhaust fan is on. Not this year yet however, and boy we’ve had the right conditions. I’m guessing maybe it’s because I deep cleaned the stove and swept the flue, also did one extra hot burn at the end of the season for us.