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Types of pipes

 
Posts: 123
Location: Quebec, Canada - 4b/5a
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Hey folks!

Glad to be here, again.

So I'm building my rocket stove in the basement with a large couch/seat at the first story.

I was wondering a few things and if I could pick your brains:

1
-Locally, there are two types of pipes available. Those for air conduct (shinny metal, light and cheap) and those for stove (sturdier, thicker, black covered, twice the price).
I was thinking of putting the first 2 pipes as stove pipe due to increased proximity with the stove, then only air conduits for the rest, as the mass should absorb most of the heat.

2
In order to build the bench, I was thinking of
I) building a wooden structure.
II) filling with a mix of rocks and perlite
III) cover with plywoods
IV) cover with a layer of cob

3
Going through the bench, which is 3 feet wide, I was wondering: one or two pipes?

4
Is a fan to push the air through the conduct a necessity?


Inputs are very appreciated. Many thanks!
 
Posts: 227
Location: US, East Tennessee, north of Knoxville
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For ducting in the bench, HVAC duct pipe is fine. Straight out of RMH manifold it's  recommended to use a section of true wood-stove pipe.

Some of your ideas have an odd mix of materials and techniques that are not normally recommended, and some can even lead to poor performance if not worse. To insure that your first RMH build is a success straight out of the gate, this book is highly recommended:

https://permies.com/t/57365/rocket-mass-heaters/Rocket-Mass-Heater-Builder-Guide
 
a wee bit from the empire
Wild Homesteading - Work with nature to grow food and start/build your homestead
https://permies.com/t/96779/Wild-Homesteading-Work-nature-grow
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