We are working on a small hutch to use as a grow out coop. It will go in the predator proof run that will be partitioned off from the big girls and house 3 chicks until they are big enough to be mixed in with the flock. There will be some ventilation right under the roof on the sides, you can see it a bit in the picture. I'm going to cover it with plastic poultry fence just to keep a chick from getting up in there (again, it will be in a fully enclosed run covered with 1/2" hardware cloth, so the plastic is ok in this instance). I'm adding a little trim undder the roof, so those holes will be a little smaller. I plan on leaving the "pop door" open all the time, so they'll have the two under roof vents and the pop door. Where would you add more? I was thinking above the pop door, but was wanting it lower to give them a little air flow low down (they are silkies so won't be roosting high). Right in the clean out door? One of the sides? The back will be up against the big coop, so that's not an option. Still have a lot of work to do on this, need to cut the legs way down and bult a ramp.