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Post by moritz on Dec 6, 2020 9:12:40 GMT -8
Hi all.
I am planning a batch RMH with masonry bell to replace our current metal box wood burner. The wood burner is connected to 200mm stainless steel duct going up 8 to 9 meters through the chimeny. After careful calculation and thinking I figured, that a 150mm core will be very much sufficient for our heat needs. From my experience with a classic J-Tube bench RMH built I know that CSA must be constant throughout the system, yet larger CSAs are fine (see stratification chambers or bells). Only smaller CSAs are an absolute no go.
My question now is: Is it fine to connect a 150mm core with correct ISA of a masonry bell to a 200mm piping out the chimney?
My feeling and my understanding is, that it will work just fine, but I wanted to get some feedback before moving on.
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fuegos
Full Member
not out of the woods yet
Posts: 177
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Post by fuegos on Dec 6, 2020 11:06:47 GMT -8
My feeling and my understanding is, that it will work just fine,
That seems to be the perceived wisdom here Moritz.i have a riserless core and Matt Walker said that the exit from the firebox should be the tightest point & that a bigger chimney was good.If i'm wrong about this i'm sure someone will correct me.
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Post by moritz on Dec 7, 2020 2:22:33 GMT -8
Hey fuegos.
Thanks for your reply. I will go for it, but keep my eye open for more replies on this.
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Post by Orange on Dec 7, 2020 12:17:38 GMT -8
bigger chimney works without problems, I have 200mm chimney and 160mm J and 110mm regular stove.
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Post by moritz on Dec 8, 2020 3:02:25 GMT -8
bigger chimney works without problems, I have 200mm chimney and 160mm J and 110mm regular stove. Ok. One more "vote" for it will be ok.
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Post by moritz on Dec 8, 2020 3:03:46 GMT -8
Some more info from my side: The stainless steel flue (200mm) not insulated. Yet the pipe goes all the way through the 8-9 m high chimney which ends 1.2m above the ridge of the roof with only these 1.2m being "cold" meaning outside air temperature. The rest of the chimney is interior and always drafts well. I tested its draft with smoke several times and it drafts well. It would be basically unmanagable for me to replace the pipe and a big waste of preexisting material. So I want to make it work.
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serg247
Junior Member
The mountain can not be conquered, it can allow it to ascend...
Posts: 111
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Post by serg247 on Dec 8, 2020 3:18:18 GMT -8
Insert a stainless steel sleeve into the chimney. Cover the gap with vermiculite or perlite.
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Post by satamax on Dec 8, 2020 10:35:31 GMT -8
Moritz, what are your heating requirements?
Surface of the house, insulation type? Cubic meters or feet to be heated? Etc!
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Post by satamax on Dec 8, 2020 10:36:20 GMT -8
Placement of the stove?
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Post by moritz on Dec 8, 2020 12:03:54 GMT -8
Insert a stainless steel sleeve into the chimney. Cover the gap with vermiculite or perlite. There is a stainles steel piping already in place thugh the chimney from the previous owners. The perlite or vermiculite idea is great though.
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Post by moritz on Dec 8, 2020 12:04:28 GMT -8
Moritz, what are your heating requirements? Surface of the house, insulation type? Cubic meters or feet to be heated? Etc! All figured out already. 150mm it is.
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