Chimney/ venting question

[NCFord]

I am getting ready to order all my chimney materials and a few questions. First I am installing an econoburn and am installing a barometric damper. My install is simply out the back of the boiler then a tee or 90 then the barometric damper then straight up through the roof then continue straight up out side the building up another 20 feet or so. So it's just out the boiler then 90 then straight up. Since a good portion of the venting will be outside I will be using the double wall SS UL103 piping( the expensive stuff)
My question is this, all the barometric dampers I have seen are just single wall black pipe. So is single wall BD ok? If so then my plan is to come off the back of the boiler with plan black stove pipe with a black stove pipe tee then the BD then transition to the double wall SS. This will leave me with no more than about 3 feet of plain black stove pipe. I am trying to keep the flue temps up, and don't know if this is an issue or not.

 

[NCFord]

So looking at other peoples boiler pics, it seems that a lot of folks just use the single wall pipe inside the building then transition to the SS double wall before
going outside. I think that will makes sense for me, plus save the cost of a section or two of the double wall stuff. The total length before transition to double wall will be about 10-12 feet. That should be fine, I guess. My shop is will not be heated it will be heated from the residual heat from the boiler.

 

[JrCRXHF]

So looking at other peoples boiler pics, it seems that a lot of folks just use the single wall pipe inside the building then transition to the SS double wall before
going outside. I think that will makes sense for me, plus save the cost of a section or two of the double wall stuff. The total length before transition to double wall will be about 10-12 feet. That should be fine, I guess. My shop is will not be heated it will be heated from the residual heat from the boiler.

I have a run of about 6-8ft before the double wall. It is wrapped in heat blanket to try and keep heat in the pipe.

 

[NCFord]

I am going to have about 9-10 before it goes outside. I just ordered the black double wall piping for inside the building then the SS double wall for outside( the SS double wall has a lot more insulation than the black double wall)

JrCRXHF, what kind of heat blanket did you wrap your pipe in that is not going to catch fire?

 

[JrCRXHF]

Morgan Thermal Ceramics blanket. We have DOW by us so they have a place that sells it i had to buy a big roll and have a lot left but it works really well i can put my hand on the pipe when the boiler is on full burn.