I have tried using a centre vortex slot in a J tube before with OK results but a single vortex seemed to work much better in the J tube, however, with this design a piece of ceramic glass above the burn chamber allows very hot air to feed directly into the base of the riser.
But how did the elephant get like that? What did you do? I think all we can do now is read this tiny ad:
building a permaculture community with hands on permaculture
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