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DarkSirrush ,

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.

m0darn ,

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

DarkSirrush ,

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.

Ix9 ,

I’m not familiar with pellet stoves, but would a converter work so you can reuse the old exhaust pipe in place?

www.homedepot.com/p/…/202191795

DarkSirrush ,

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.

Dixiewalker108 ,

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.

DarkSirrush ,

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.

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