Try leaving the bottom doors open. If that's sufficient I would still clean vent holes in the doors so you don't need to use fans.
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Leaving the bottom doors open leaves temptation open for the cats to go where they shouldn't be lol not to mention the light leaking out from the mars. It's in my living room so the light would be distracting. Maybe I won't need to runt hem for too long a day?
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