Best way to seal fireplace?

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papakevin

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So I have a new to me house with a main floor fireplace and a basement fireplace which share a common chimney, both with an insert. Yesterday a backdraft situation occurred and basement filled up with smoke. Looking into the basement insert, I realized it was not properly installed (see photos). Since we never use the basement fireplace, I'm looking for a quick and temporarily way to seal off the basement fireplace flue.

Can I use standard pink insulation to stuff up the flue? If not, what can I do? View attachment ImageUploadedByHome Repair1424619934.922257.jpgView attachment ImageUploadedByHome Repair1424619952.021765.jpgView attachment ImageUploadedByHome Repair1424619969.488551.jpg




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Not sure I understand. We still need to use the fireplace on the main floor, as our house has a hear pump which struggles when the temps drop into the single digits. Both fireplaces use the same chimney, so don't think I can cap the chimney and still use the main floor fireplace, correct?


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Each fireplace should have it's own flue and ir's own damper, as I understand it.
So if one is not being used, you could capped. You must have something different than that.:confused:
 
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