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The open fermenter may ferment cooler due to the insulation of a lid, just as a pan with a lid on boils faster, but I can see the difference being huge. that is all things being equal. One difference that could potentially affect things regarding temperature would be the availability of dissolved oxygen, with more O2 available the yeast should be able to ...


There is virtually no pressure difference between open and closed fermentation. Evaporation, on the other hand, could cool the open fermenter.

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