>This is the way air exchange takes place within the cluster so that air
with abundant O2 replaces air that is abundant with CO2.

Right on all points Mike, but be aware that there is very little actual air
exchange in the cluster.  The bees manage the within-cluster atmosphere to
maintain a much lower oxygen, and higher CO2, content than that of the
surrounding atmosphere.  To do so requires that they nearly completely block
air exchange!

Randy Oliver

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