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Message: <blockquote data-quote="DustyD" data-source="post: 196570" data-attributes="member: 36911">That is a very interesting question. As science is not my forte, I just assumed cross ventilation meant having holes on the sides of the enclosures instead of or in addition to vents on the top.Whether a source of air movement is needed to facilitate cross ventilation I am not sure. I myself have bought a small fan 3-4 inches that I plan to use this summer to help cool down my enclosures.  I don't think I will use it directly on them, just in passing. I have read that fans can dry out enclosures.Hopefully simeone with more experience or science brain will answer.</blockquote>