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8” system with 6” hole in cieling?

 
Posts: 75
Location: North Idaho at 975m elevation on steep western slope, 60cm annual precipitation, zone 4
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Anyone have experience? I know you can do this with normal wood stoves. The previous owner did stuff I need not explain but basically secured that only a 6” pipe can go through the cieling, but I want an 8” system. Will it work? How much vertical draw will I need for the transition to not throttle it and back draft?
 
gardener
Posts: 3050
Location: Southern alps, on the French side of the french /italian border 5000ft high Southern alpine climate.
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If you search well, there is a subject about the exact same situation, may be two years old. Or more.
 
gardener
Posts: 2213
Location: latitude 47 N.W. montana zone 6A
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cat pig rocket stoves
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Planning on doing that this summer.
 Replacing my old standard double barrel stove in the shop with an 8" J tube and a double brick bell. It will have a 20' rise up to the roof with most of it being 8" but the roof has a 6" metal bestos chimney so reduce to 6" for the last 2'.
I know that Matt Walker and others have done this.  I expect/ hope for , no issues with it.
 
gardener
Posts: 2967
Location: Upstate NY, zone 5
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You would want a smooth, gradual reduction to reduce the throttling effect. I would say that an 8" to 6" reducer 6" long would probably be enough.
 
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This thread describes a J type rocket where the flu goes down from a 8" to 5" before it exits the house:
http://donkey32.proboards.com/thread/2439/tell-burning-clean
 
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A rocket mass heater heats your home with one tenth the wood of a conventional wood stove
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