BPatrick wrote:Paul, I'm curious how the exhaust gases travel. Is there an inner barrel and what is the exact path. It seems to me that they are on the verge of perfecting this type of design even back then.
If you mean the Glenwood Modern Oaks with the optional back pipe, ......
No outer barrel or suspended pot. The outside of the firepot is what you see below the lower set of nickel plated skirt pieces and above the ash drawer/grate casting.
The exhaust gases go out a pipe collar at the back upper part of the barrel, a bit higher up then they do on the Glenwood base heaters. The flue gases can either travel through the open pipe damper straight to the stack in direct mode, or, in indirect mode, . . .
The back pipe has a vertical cast iron divider that separates the front half of the pipe from the back half with a rectangular damper near the top of it. The divider has a semi -circular gap in the bottom edge that the outer edges of rest in slots in the base casting.
With the back pipe damper closed (indirect mode), . . the flue gases must travel down the front half of the back pipe, then make a 180 degree turn through that semi-circular gap and the base support casting, then travel up the back side of the pipe and on out to the stack.
The back pipe support casting bolted onto the back of the ash drawer is only for support. It does not have any opening into the stove's base.
There is no flue chamber under the ash drawer area like the base heaters have. The bottom pan of the stove is the bottom of the ash drawer.
The two pictures show my 118 ash drawer on it's sides. The back pipe base support casting, with it's oval opening, can be seen bolted to the rear. What you can't see is how that casting is blocked off from the ash drawer area it bolts to.
The casting has a small clean out door on the rear side, but it's so small that I think I'd have to use a soup spoon to get any fly ash out.