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I doubt it would cause a problem with humidity since it is exhausting out.
There are other styles that can be used on existing windows or hatches, like those car solar fans. You might even be able to rig something up with a small solar panel outside to run an interior fan.
Another idea might be to set an electric fan on a timer, so it's not running none stop ( a thing that would worry me too) and have it go on an hour or so a few times a day.
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