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Yes that's probably an ideal spot - the barn would provide a lot of protection and there'd still be some passive air movement in that space. It's really no different than a vent with louvers or a buffer over it - the barn wall becomes the buffer.

At 2 sq ft each that would provide you with about 50% of the ventilation you'd want. Weather permitting, might want to go around and check around the soffits under the roof to see if there's any areas you can easily open up for effective high ventilation. Or consider gable style vents placed...

Are those windows the only ventilation? How many birds do you have in there?

Sounds like that should be enough, though I'd add the window anyhow for extra light and optional ventilation (assuming it opens and shuts).

Answer depends on how large your coop is, and how many chickens.