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New Banco box project

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Hy everyone!!!  from Madrid Spain I'm New here
I am building a batch box and I want to ask you if it's posible to put double size of bricks (2 tiles) for the chimenie instead of 1 tiles of bricks, without   the 1thbarrell around the bricks. Only put the outside big barrell
Thanks
 
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Location: Southern alps, on the French side of the french /italian border 5000ft elevation
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Ola Manuel.

The less mass in the heat riser, the better. But if you use insulating firebricks,  you can do pretty much what you want. For a batch box, a barrel is not optimal, check your clearances.
 
We can walk to school together. And we can both read this tiny ad:
Heat your home with the twigs that naturally fall of the trees in your yard
http://woodheat.net
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