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.
You learn how to close your eyes and tell yourself "this just isn't really happening to me." Tiny ad:
Escape to gardens and natural buildings (for free-ish) in Montana
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