Me again. Here are the vent covers. They are screened louver vents (about 1' square). DH made covers on the inside that we operate by a pulley system in the attached grain shed. I hope they do the job. They don't open fully, so far, with no chickens, we can easily control condensation on the windows using these vents (in about a minute!). Let me know what you think. It's his new invention and he's SUPER proud!