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You are very welcome.
This is kinda strange, and I didn't really plan to test this way, it just kinda happened. We had a huge fly outbreak from one of those stupid fly catcher bags, so I got my compressor and drywall texture gun, and sprayed DE inside the coop and all over the inside of the barn. Our coop is actually built in the old tack room, with pine trunks as supports. We put the OSB right up to the trunks as close as we could. All the other walls are somewhat square but to stop intrusion I placed a piece of OSB at a 45* angle in all the corners. So the the coop is somewhat tight but has an envelope of fresh air around it. ANyway, While spraying the DE, I did not want it to go everywhere, so I closed up the window, door and shutters.
After walking out, it looked like the coop was on fire, except with white smoke coming out of all the corners where the coop is, and from under the roof. There was little if any breeze that day also. So by accident I was able to see that in fact there was ventilation in the coop, that was basically caused by thermal expansion.
Is there a ratio or something, I am sure there is, but I have no idea. As far as is it enough, I really don't know that either, I do know that our litter is bone dry, it is a bit damp in the morning, but not for very long. To test, I would put a fan on and sprinkle DE in front of it (not on it) or take an air compressor and and blow a pile off of a plate shut the doors, stand outside and watch. If there is air movement, the DE will find it and you will be able to see the ventilation. Preferably do this on a windless day.
As far as knowing my chickens, I suppose, but we raise them much the same way we raise our cattle, and for that matter our two boys. The strong will survive, the weak will die. We give them food, a source for fresh water, and the shelter we can. The rest is up to them. In reading through the threads on the site, it is apparent that there are a great deal of chickens who are raised similar to a great many children, pampered, spoiled and weak. That of course is the owners right, and for all I know I am wrong, but we choose to raise them tough so as to have robust, healthy, vibrant chickens who can take a smack on the mouth and keep walking.
Just my opinion though, and as I said, It may be woefully inept and misdirected. I will find out in two months...