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[–] SmokeyTheBear420 0 points 0 points (+0|-0) ago 

Greetings

At the Reptile parks I've helped build we only used PC fans for extraction on all the enclosures, keep in mind all these enclosures were huge, larger than what one would house the average reptile in because we had to create naturalistic displays.

In my honest opinion I don't think a fan is necessary for your setup. If you intended on blowing air into the cage it would just stress out the gecko and if you intended on using it for pumping are out, with a screen lid you already have ample extraction, anymore would cause issues keeping humidity.