Thats a good idea Ryland. I had thought about it, but didn't think it would be that big of a deal. The chimney is currently cut off in the attic. But, there is the exhaust pipe for the gas water heater going up it from the basement. It is mostly sealed on the bottom end, but totally open on the top. I'll definitely look into sealing that up with some polyiso and high temp silicon. Thanks.
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