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smoke back up...

Posted by ribmaster (My Page) on
Sat, Feb 9, 08 at 16:24

my cousin has a free standing fireplace in his small Carriage house that has a TV and tables chairs etc. so in the winter time he lights a fire and he gets a lot of smoke back up ...everything is new,chimney has a cap on it, damper is open wide, the pipe is a 8" into a 6" that goes into a 2 bends then up the chimney and out the top of the roof...any idea why it is (smoke) backing up ...only happens when the doors are open to the fireplace.......TIA


Follow-Up Postings:

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RE: smoke back up...

How tight is the house? It sounds to me there's no draft. Crack open a window and let some air flow in the house.
But I don't understand why the chimney is going from an 8" which is what's needed for a fireplace, to a 6" which is what's needed for a woodstove.
It's like having 3" exhaust pipes coming from your car engine and then halfway through the exhaust system, going down to 2 inch pipes. It's just doesn't work.
You're restricting the flow of the exiting gasses.


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RE: smoke back up...

Sounds like a fireplace that was installed without any consideration to proper fireplace design. Many contractors just build these from gut feel, but there is much more technical consideration required. It all has calculations...firebox opening, flue size, chimmney height, direction of the roof, etc.


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RE: smoke back up...

I agree totally with the last 2 posters, but I would like to add several other things that could possibly cause this problem. The chimney should be at least 2' above the peak of the roof. Sometimes nearby conifer trees can cause negative draft depending on which direction the wind is coming from. Does the stove have a catalytic combustor? Is it clean?? Hope this helps! PLEASE get back to us & let us know how you make out!

Jim


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