Smoke backdraft

Jeb17August 17, 2014

I own an older home with 2 fireplaces. Fireplace 1 is on second floor with approx. 20foot chimney of brick. Old owner removed damper so flue is open all the time. (Another issue). Smoke flows into room when burning fire from start to finish. Weather occasionally helps but does not eliminate problem.
Middle of open field so no trees to block airflow. Flue is at least 10" in diameter. Opening windows doesn't seem to help and house is very well ventilated. Tried burning further back in firebo and burning newspaper first to heat chimney but no help. Have standard chimney cap with lots space avove chimney opening.
Tried so much and no luck! Any tips greatly appreciated!

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christopherh

Go to Hearth.com and post over there. Those guys are experts and I know they will have the solution. The link to the forums is below.

Here is a link that might be useful: Hearth.com Forums

    Bookmark   August 19, 2014 at 6:40AM
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jrb451

You can add an extra flue tile on top. That should improve the draft. (I had to do that to one of mine. I later bricked around it to make it look better.) You checked for obstructions already, correct?

    Bookmark   August 25, 2014 at 1:12PM
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Jeb17

No obstructions. Recently cleaned. Possible that a brick is missing part way up the flue. Told its not a fire risk by inspection but wonder if this could affect draw? If I add another flue tile I'd likely have to raise the others as well no? As well as chimney cap. I'm not sure thats an option but I appreciate the post! Will also post at hearth.com
Thanks!

    Bookmark   August 27, 2014 at 4:18PM
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renais1

We had friends with this problem. They installed an exhaust fan in the chimney which runs when there is a fire. It solved the problem immediately.
Renais

    Bookmark   August 27, 2014 at 5:01PM
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jrb451

You -> Possible that a brick is missing part way up the flue. Told its not a fire risk by inspection but wonder if this could affect draw?

Me -> This sounds like your flue doesn't consist of flue tile or other type of lining; it's just a brick opening. In this case a missing brick could affect the draw.

This fireplace is on the 2nd floor, correct? If both chimneys are at the same elevation above the roof, then this one will have a shorter run than the one on the first floor. Adding a tile to increase it's run would increase the draft and should have no affect on the others.

    Bookmark   August 28, 2014 at 3:18PM
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