You might also make use of a chimney (no kidding).
Putting something hollow (open at the bottom and the top) may give you some additional air flow without having to use a fan. To see what I'm talking about, make a tube with a piece of paper and hold that above a heat source, like a light bulb.
I'm surprised they didn't do something like this for the reserator - maybe the additional size makes it impractical...
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