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Venting Requirements?

 
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My question is:  Per building code, what are the venting requirement, to the outside, for a rocket mass heater?  Does it need a flue or pipe to extend above the roof line, or can it just be stubbed out the side of the house?  

Thanks
John
 
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Location: Southern alps, on the French side of the french /italian border 5000ft high Southern alpine climate.
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Stubbed outside of the house doesn't work. Except in a verry few, and rare cases.

And the law, i think, calls for a proper insulated chimney, raising above the roofline.
 
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