insulation - How can I insulate my fireplace when it's not in use

I have a wood burning fireplace insert, that is not currently being used. Now that it's cold in my area (27F), I've noticed that there is quite a draft coming from the fireplace. How can I cover/

10' x 1-1/2 wide strip of fiberglass insulation Use between a fireplace insert and the surrounding masonry Forms a smoke and gas tight seal Replace

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