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There are a number of rocket stove designs available but from your message it looks like you are interested in the institutional rocket stove which can be seen in the video from the Practical Action East Africa office https://practicalaction.org/rwanda-rocket-stovelink text This uses an oil drum as the main body and looks to be suitable for 50-300 people. However, this design originates from Aprovecho and there are some instructions on its construction on the Aprovecho site https://www.aprovecho.org/lab/rad/rl/stove-design/category/1 and specifically Institutional Rocket Stove https://www.aprovecho.org/lab/rad/rl/stove-design/doc/16/rawlink text

If you are looking for something smaller then Practical Action East Africa has also been involved in another design which is described in the attached technical brief which is not yet online and is only in draft format, it is similar to the one described by Stewart Brown on the Practical Action website. We are also writing a more generic document about rocket stoves which I have attached, again this is only a draft at this stage but I hope that the information is useful.

link text https://www.aprovecho.org/lab/rad/rl/stove-design/doc/16/raw link text