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The specific gravity of ammonia is 0.59 compared to the SG of air of 1.0. That means ammonia is a lot lighter than air so it does not take much of a hole up high to vent ammonia. You still want to keep the coop dry so the wet poop doesn't generate large amounts of ammonia as it decomposes...

The magic numbers that everyone mentions are pretty much for a small backyard flock where they are all fully integrated and no more than one boy. It would be a fixed coop and they have reasonable access outside on most days. Even with that set-up, those numbers are overkill for a lot of...