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Thought that I would try my l luck at building a gravity-fed reverse flow after helping a buddy build a stumps clone.. Had lot of companion flanges laying around the shop and went with it.
Rolled 16g black iron to form CC add 3\16 RF and a pitched grease trap. CC is 23 dia,x 30 long.. Chimney is short after checking calculator . Will change by finding a creative way to add length.
Yes, more or less. Charcoal should burn slowly in the vertical chamber.. The small coals will fall thru a grate at bottom of cylinder into a pan of wood chips,, heat and smoke transfer to CC where the magic happens.. The ball valve is the only air inlet into fb.. Makes a good hook up for a Guru.. It's either going to work or be a big boat anchor.