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nearly done with my insert install. wanted to know if i needed to seal the connection between the insert adapter and stove (and adapter and liner for that matter) with silicon or furnace cement or...
I asked my stove dealer this question and he said it isn't necessary if you have sufficient draft. So I didn't seal mine (just secured with screws) and haven't had any problems.
There is a slight vacuum at the bottom of a flue, so some air will leak in & reduce your draft. A well-fitting collar won't really let much air in though, so you'd likely never notice a difference. I sealed that and the adapter to flex-pipe connection with furnace cement. No big deal either way.
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