My experience is that 1007 will require a blowoff if not in the lower end of its temp range. I had a 3 gallon BB with probably only 10% headspace not need a blowoff at all, but I kept it at 52-55 F. When I had a 5 gallon batch in a 6 gal BB, and let the temps get up to 70, it absolutely erupted. I think that batch had blowoff for 2-3 days straight.
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