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It is of course, difficult or impossible to read any coop venting, but the "safe middle ground" is large enough for the actual numbers to be quite rounded. You could use an actual chimney to exchange air and read it. Been pro and conning coop chimneys lately. Sorce

I reckon with three figures... Number of Chickens. Cubic feet of coop. And vent CFM. (Cubic feet per minute) You can figure a perfect situation. For instance, my 2 hens won't sufficiently heat a walk-in sized coop. But they can fog up say, an aquarium. That middle ground is where you want to...