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Think this 8" will work well?

 
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Greetings from cold Denmark

I'm just about to build my rocket mass heater. Would you guys let me know from a more experienced builder, if you think this will be a pretty good build - please help.

Here's a link of my plan:
https://drive.google.com/file/d/0BwnOTepq0QVqR1cwNkc1emh0cGhvZ2h0U2JOQjFRVFF0Mko4/view?usp=sharing

The whole system is 8" - the end chimney is a 12" and is 21feet tall indoor isokern.
The burn tunnel is close to 25" from end to end. And heat riser is close to 51".

The ducting is close to 18 feet.

Think this is a pretty good build that will probably work?

Hope you'll give me your thoughts on this.

Sincerely
Michael

 
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