What is the purpose of "insulating" the stack

[dobson156]

Following this thread:

https://www.smokingmeatforums.com/t...sustain-big-fire-modification-project.287777/

I've decided to take the grind and welder to my smoker and try and convert it into an normal offset.

I've been looking into a good stack design and whilst doing research I stumbled across this video where the host is modifying an off the shelf smoker.

Here he is describing the modification he's going to do.



And here he is doing it.



Here part of the chase that intersects with the stack itself is effectively double walled, he calls his metal insulation.

I was going to add a triangular style chase to my smoker, but I also have enough material to double wall it like it's shown in that video. Is it worth doing? What does it add?

I've not seen it done anywhere else.

Thanks

 

[pigbark]

from the top of the Chase to top of exhaust i dont think it does much.. it looks good but imo thats all.. why insulate a exhaust after the air has expanded? the opening of the exhaust is the measurement used for proper draw so the doubled area is dead.. i think it just adds looks but maybe someone else on here will chime in...