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That new info helps a lot.

Well that's according to is you are trying to vent out 120 degree heat in the summer or some condensation in the winter.

It don't take as much ventilation in the winter that's why I suggested fixing them where they will close---I am thinking a cross breeze venting where it takes no electric!! Just a Thought.

Cut sections out and put hardware cloth over the holes on one side of each cut out and hinge the cut out part back in place so it works like a door. Do that in several places and yes there is solar exhaust fans that will draw out some heat when the sun is shinning----I got some of them.