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Nice design Tom, thanks for showing it.
Since the output is so cool, I wonder how a small centrifugal blower pulling vacuum on the output stack would help e.g. in startup and to help maintain the vortex in the main chamber.
With a speed control on it, the burn rate and heat output can be better controlled.
A vacuum at the top of output stack (on the outside of the building) is a lot safer than a blower on the input, especially if the system is not perfectly sealed.
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"Secrecy, secret societies and secret groups have always been repugnant to a free and open society"......John F Kennedy
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