If you build an arch, as stated, get the pan first. Then build the arch with 3/8-1/2" overlap of the pan onto the arch. Lets say the pan measures 24" wide, the opening for that width should be 23-23.25" wide, the outer width can be anything over that within reason. Especially if you plan room for firebrick. Having more overlap creates a strip on the pan with very little heat transfer, the wider that strip the poorer the boil in the pan. A pan needs the heat applied directly to the bottom.
Dave Klish, I recently ordered 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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