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Old 10-06-2010, 10:30 AM   #1
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Smoke from Woodburner coming from Furnace


I had a fire burning in my woodburner yesterday and left the house for an hour or so, only to return to smoke eminating from my gas boiler, which has not been turned on for the season. They are flued separately but in the same brick chimmney and I have never had this problem before. Could it possibably have something to do with it has been cold 40 - 50 degrees and raining for days? I do not have a cap on the chimmney. I have cleaned the chimmney.

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Old 10-06-2010, 04:20 PM   #2
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Smoke from Woodburner coming from Furnace


Yep. When it rains the barometric pressure changes and chimneys sometimes lose their draft or it changes. Possibly you had/have a negative pressure in the house and a slight downdraft in the boiler chimney which was cold and not drawing upwards as the boiler wuz off.. If the woodsmoke was not leaving its chimney fast enough it can get sucked back down the boiler chimney (in theory). Would only happen if it was very calm/not windy outside at the time.

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Old 10-06-2010, 07:00 PM   #3
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Smoke from Woodburner coming from Furnace


Downdraft may be the cause, however it may be more serious; you may have a failure of the two liners and the flues are now connected inside the chimney. this is a very serious condition and you should have it checkout by a professional who can scope the flues.

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Old 10-13-2010, 09:12 AM   #4
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Smoke from Woodburner coming from Furnace


We have had a half dozen fires since with no problem including that we opened the door that night and it corrected the problem. We are confident that it was a one time thing. Thank you!
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Old 10-13-2010, 07:30 PM   #5
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Smoke from Woodburner coming from Furnace


Get 2 new CO detectors one in the basement and one by your bedrooms. Any fossil fuel or Carbon based fuel, wood/coal/oil/nat gas can produce CO if not burning properly.
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