Help passing pipe through non-combustible wall see below!!

[Cconra14]

We had a very odd small and old shallow fireplace with a brick front to it I wanted to block off the wall and eventually put a freestanding stove in the room, with pipe running through the wall, into the masonry chimney void and connecting to a stainless flexible flue liner up the chimney. Accordingly I proceeded to demo the brick fascia on the front, and put up a flush non-combustible wall made from metal studs, which will then be insulated around with rock wool and covered in durock and non-combustible stone veneer.

My question is, what is the suggestion for connecting the single wall pipe off the stove, through the non combustible wall, then connecting to the liner in the old brick chimney? Can I use a masonry thimble through my metal stud and durock wall? Although not "masonry" the wall section it is passing through will be totally non combustible and well away from any combustables (nearest would be the header from where chimney pipe would pass, almost 36" above the pipe wall entrance. Don't let pics fool you the header is about 6' from the floor, the non-combustible metal stud wall is about 8' wide x 6' tall, pipe will enter somewhere around 36" -40" high in the wall. Thoughts?

 

[begreen]

Typically, a stainless tee would terminate the liner with an extended snout that connects to the singlewall via a thimble in the non-combustible wall.

 

[Cconra14]

So you're saying run the flex liner down to a T at bottom, then run the snout of the T to a masonry adapter through the wall?

 

[begreen]

Yes, as long as there are no combustibles within 18" of the thimble.

bholler any added thought?

 

[Cconra14]

Yes, as long as there are no combustibles within 18" of the thimble.

Thank you! That's what I was assuming but wasn't entirely sure ....only thing remotely close will be metal studs and mineral wool batts so totally fireproof

 

[begreen]

Note that this type of install locks one into a specific flue outlet height of a specific stove. It can be a challenge to refit if the stove needs to be replaced with a different one for some reason down the line.

 

[begreen]

All components through and behind the wall must be stainless. Servicing will mean tearing apart the wall, so use a heavy-duty liner.

 

[bholler]

Thank you! That's what I was assuming but wasn't entirely sure ....only thing remotely close will be metal studs and mineral wool batts so totally fireproof

Well to start off get all of the highly combustible fire foam out of there. Then seal off any passage from the non-combustible area into the combustible area properly with metal or masonry then allow 24" from the pipe to any combustibles

 

[brenndatomu]

Could a section of doublewall insulated 8" chimney pipe be installed through the wall as a thimble?
Also, since that thimble height can limit the height of any future stoves, I'd install the thimble a little high...not that hard to customize the stovepipe to fit...

 

[bholler]

Could a section of doublewall insulated 8" chimney pipe be installed through the wall as a thimble?
Also, since that thimble height can limit the height of any future stoves, I'd install the thimble a little high...not that hard to customize the stovepipe to fit...

Both good ideas

 

[Cconra14]

Well to start off get all of the highly combustible fire foam out of there. Then seal off any passage from the non-combustible area into the combustible area properly with metal or masonry then allow 24" from the pipe to any combustibles

I thought the clearance required was 18"? I will definitely be >18" from the only combustible item, which in my situation would be the header above the non-combustible wall section. That being said, I'm open to suggestions on how you would block off/shield the wood header up above from the pipe pass through even more? I plan to use a masonry thimble (or use a 8" double wall section in the pass through) then wrap ceramic insulation around the pass through. What more should I do to block off the header from the pipe heat? Header will be almost 36" from the pipe pass through.

 

[bholler]

I thought the clearance required was 18"? I will definitely be >18" from the only combustible item, which in my situation would be the header above the non-combustible wall section. That being said, I'm open to suggestions on how you would block off/shield the wood header up above from the pipe pass through even more? I plan to use a masonry thimble (or use a 8" double wall section in the pass through) then wrap ceramic insulation around the pass through. What more should I do to block off the header from the pipe heat? Header will be almost 36" from the pipe pass through.

Going through a wall it's 24" of solid masonry to combustibles

 

[Cconra14]

Going through a wall it's 24" of solid masonry to combustibles

What would you suggest I do for this install? Just pass through the metal stud wall as I have described but make sure it's 24" away from any combustables?