A rocket stove is an efficient cooking stove using small diameter wood fuel which is burned in a simple high-temperature combustion chamber containing a vertical chimney and a secondary air supply, which ensures almost complete combustion prior to the flames reaching the cooking surface.
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Many designs, methods and materials can be used to construct a Rocket Stove. This is one example:
4-Block Rocket Stove Construction Video
4-Block Rocket Stove Construction Document