Roaster exhaust pipe precautions...

[AdventureCopan]

Does anyone know if when running roaster exhaust pipe out a wall would I need to use special insulation in the wall to protect from heat? How hot does the pipe actually get? It's double walled insulated pipe I'm using. Thx!!

 

[Musicphan]

It will depend on the duct work and type of wall... look at the spec sheet on the duct work.. it should show if its designed for zero clearance.

 

[chast]

If you are in a wood building you need a wall thimble. If you are using double wall pipe then you need to order the thimble according to the inner pipe not the outer. UL 103 and UL 103ht Type A is what you want to look for. Most wall thimbles will fit any pipe

 

[TrivixXx]

use special insulation

 

[AndyP]

My double wall pipe made by nordfab came with a stainless 2 layer wall thimble to protect the wall. That being said you could probably rig up a wall thimble for a woodstove depending on what what wall is made out of ( and drywall is not flammable ). The outer pipe gets pretty hot to the touch where it goes into the wall. I think the real danger would be if the exhaust ductwork caught fire.

 

[AdventureCopan]

Ok I looked at the label and its 2" from combustible. Sry all, but good info here anyway! The inner/outer walls are wood. I'm thinking of running out the window as I think we may out grow this spot fast and I don't wanna do more work than needed if that's the case.

 

[Mr.Peaberry]

Hi Daniel,

It's funny how you will get responses that open your eyes to a product you've seen before, but never knew what it's called, as in the case of a "wall thimble". I'm pretty sure I know what "special insulation" is though. My two cents? Treat the wood with a ceramic fire/heat retardant like chimney caulk or something of the sort, at least for a foot or two perimeter around the thimble as AndyP was spot on with his assessment of where the real danger lies.

Cheers,

Peaberry

 

[AdventureCopan]

True and lol! I never knew what that was called. Going to find one now.

 

[AdventureCopan]

Ok so I found the thimble on Amazon. My next question is, I need to get another 3' at the top to get it above the roof line. It won't be touching anything, so do I need double walled for the top piece or can I just go single walled regular pipe. Up to that point it will have passed through approx 10' of double walled.

 

[chast]

The picture you posted is what I had to purchase to go through a side wall. Wallboard is considered combustible and even if you put up fire rated board the lumber is combustible. That thimble I believe will extend 10 inches and gives the n.eeded two inch air gap. On northern expresses site they have section that describe what is considered combustible. I found mine on eBay with free song brand new for 46.00

 

[chast]

Outside pipe does not need to be double wall but if you already have the length then use it

 

[chast]

Here is what I did

The outside exhaust

 

[AdventureCopan]

Cool, thank you! Just out of curiosity, are those condos? Does no one complain?

 

[chast]

This is a converted factory with artists and other businesses. Over 100 potential new customers.