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Is this only an issue when fireplace is not in use and if so is there no damper in the vent?
Also if you could provide me with model on the fireplace and maybe some photos of the situation as I am depending on you to be my eyes.A picture outside of the chimney location and termination may be of great help.
If you have a paper clip icon on your page you can attach using that link.Or
You can upload the pictures using the tiny pic site .
Here is a link to the site.
Click on Browse , select the file from your folder.then click UPLOAD NOW.
They will give you a quote to enter in the box to verify you are a human.Enter the quote and click UPLOAD NOW
You will see your picture on right side of screen.
Then copy the link URL for email & IM
Paste that link here on the site.