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Here's the theory of coop ventilation as I understand it. Chickens exhale a lot of moisture when they breathe (and moisture in their droppings, which will accumulate in the bedding if you're doing the deep litter method). You don't want humidity to build up inside your coop because this leads to poor air quality, and also in winter to frostbite (the moisture in humid air tends to condense on surfaces including the combs of chickens, where it can freeze and cause frostbite in the winter). So you want to keep the humidity in your coop as low as possible by venting the warmer air because warmer air contains more moisture. Warm air rises, so ....you put your vents up high at the top of walls where the warm, rising air can exit.
The other advantage to putting the vents up high is that you can leave them open without having drafts blow on your birds who will be roosting below this level.
There's nothing wrong, per se, with your old timer friend's approach; I just don't think it's an optimal arrangement. He's right on the money, in my opinion, with his recommendations about space per bird.
Here's the theory of coop ventilation as I understand it. Chickens exhale a lot of moisture when they breathe (and moisture in their droppings, which will accumulate in the bedding if you're doing the deep litter method). You don't want humidity to build up inside your coop because this leads to poor air quality, and also in winter to frostbite (the moisture in humid air tends to condense on surfaces including the combs of chickens, where it can freeze and cause frostbite in the winter). So you want to keep the humidity in your coop as low as possible by venting the warmer air because warmer air contains more moisture. Warm air rises, so ....you put your vents up high at the top of walls where the warm, rising air can exit.
The other advantage to putting the vents up high is that you can leave them open without having drafts blow on your birds who will be roosting below this level.
There's nothing wrong, per se, with your old timer friend's approach; I just don't think it's an optimal arrangement. He's right on the money, in my opinion, with his recommendations about space per bird.