When I had a half pint (2' x 3') I used 10' of stack, just to get it up above the tarp roof more. I also sloped it away about 20 degrees and braced it. The stack and fire worked good. Adding more stack will give more draft. If you get too much draft just adjust the air inlet. Just remember, you want the fire to burn as fast as your rig can handle, only slow it if you have geysers shooting up and out of the pan.
Dave Klish, I recently bought a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.
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