Typical Surface Temp on Double Wall Chimney Pipe

I'm beginning the install of my Englander 30. Due to many factors, I am forced to go through the ceiling of the first floor....pass through the 2nd floor bedroom, and out the roof. I am building a chase and strictly adhearing to all local codes and manufacturers guidelines.

That said I am amazed that I can install the pipe (Metal-Fab DW) 1.5" away from combustible materials. My plan is to install it no less than 3" away but I am still amazed. I will line the interior of the chase with sheet metal while I'm at it just for good measure too. This may or may not be helpfull.

What are the typical double wall surface temps of an average fire? Same goes for the double wall stove pipe...I imagine that must be hotter.

Thanks!

Jimbob said:

Normally people start with class A at the ceiling, and keep going with it right through the second floor, then out through that ceiling, then through the roof.

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I'll be using double wall stove pipe from the stove to the ceiling, into the ceiling support box, and then double wall chimney pipe from there through the second floor and out the roof. That sound normal right? I'll be using rafter shields and firestops too.

Oooo....good idea on the vents. Upon further inspection, Metal-Fab specifies 2" minimum clearance. I still plan to keep to 2.5" min anyways just for the heck of it. Most of it will be 3".

+2 on the vents. The only problem I see is that there is generally some outside air coming into the chase. The roof flashing usually has some small vents right below the storm collar. In most instances this air can travel down the chase.

My concern would be that outside air would make its way into the room via the vents.