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this post was submitted on 08 Sep 2023
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Do It Yourself
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Replacing our incredibly sketchy wood stove with a gravity fed pellet stove.
Still mulling over how to replace the pipe on the roof, since the opening was built for a 7" pipe and the pellet stove requires a 3-4" pipe at most.
Heavily considering running the new pipe through the current one and paying someone to do it right next year.
Not something I have any experience with but please allow me opine from my armchair:
the only problems I forsee with that approach are:
-- any bends you might have to navigate -- supporting/stabilizing the new pipe -- sealing the top to prevent a down draft forming between them and pulling exhaust into your home
There are no bends, or I wouldn't even consider it, and figuring out the support/stabilizing of the new pipe would likely tie into sealing it to prevent the downdraft.
Those are good points though.
My sister's creosote build up in her exhaust pipe ignited one Thanksgiving. A fire of sticky tar, in a tube running through inaccessible walls and roof. That was interesting (ripped the pipe out quickly and it was contained). You may want to inspect before adding in a new exhaust, if you haven't yet.
Chimney fires are incredibly scary, and I definitely will be cleaning the old piping before I do anything else. Fortunately I don't have any sort of attic or complicated setup, it just goes through about 1' of ceiling/roof and that's it.
I’m not familiar with pellet stoves, but would a converter work so you can reuse the old exhaust pipe in place?
https://www.homedepot.com/p/Master-Flow-7-in-to-4-in-Round-Reducer-R7X4/202191795
Yes, but I need to make sure it doesn't increase the airflow by a very large margin, or it affects the stove in a very negative way (either burning dangerously hot, or causing smoke to go the wrong way, etc).
Mostly I need to inspect what's currently in place and see what fits where to figure out what I am doing.