We have recently taken on a small project of restoring a derelict bit of land, that has stables made from breeze blocks. We'll be allowed to do as we please with it, so, of course, we'd like to convert a couple into chicken coops. The easy bit is the planning. The question I have is about ventilation. There are about 4 stables, so we'd like to use two. We'll be building dividing wals between the two stables, that go halfway up, then metal bars the rest of the way to the ceiling. Each stable has a stable door to the outside (or not at this stage, but we can soon build some). I was thiking about covering the top half with mesh, so I can leave it open in the summer, and close it in winter. Maybe even use plxiglass, so they have some daylight? As we'll only be using half the space in the building, what amount of extra ventilation would be needed?