Has anyone used one of these on their coop? I am converting a shed to a chicken coop/goat house and I am concerned with ventilation. I was thinking of putting one of those metal security screen doors on. Their house faces south and is a somewhat protected area where they won't be getting blowing snow or rain or anything. We will also be putting a small roof over the door, which will protect it more. They seem pretty sturdy and I thought this might give us some added ventilation year round. They also lock so I can lock the animals in at night and they would be well protected I think. Anyone else use one of these? Your thoughts?