Many pictures and oven designs (including those at Pompeii) show a vent arch higher than the height of the oven opening. Surely this would encourage combustion products from the oven to exit through the vent arch, rather than solely via the chimney? Would it not be better for the height of the vent arch to be the same as the oven opening? Of course it cannot be lower as there needs to be sufficient access to place a door over the oven opening, but surely the same height would create a more efficient draw?
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