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rocket mass heater: a smaller hole in the wall

 
steward
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Location: missoula, montana (zone 4)
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Since the exhaust from an RMH is just a tiny dribble .....

And since the 8 inch myrtle system drops to seven inch ....

I wonder ....  if I have a six inch system and then I get to the last little bit of exhaust that goes out the wall like a clothes dryer vent .... and a clothes dryer vent is typically 4 inches ....  would it be okay for the six inch system to reduce to a four inch system at the point it goes through the wall to the great outdoors?

 
gardener
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Location: Tonasket washington
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you can just make sure the exhaust temp is low enough for that to work or you will have smoke back problems
 
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