Hi!! I'm new to chickens and I want to do right by them. My husband is going to make a tractor for them to live in soon and we are not sure where to place the vents. Our tractor will be 3 x 3 x 3 for their sleeping area, 3 feet wide, 7 feet long and 6 feet tall for their run. He was going to put two vents on top across from each other and then one lower vent on a side wall. Should he continue with this plan? Any help would be appreciated. Thank You!!