I am building a 6x4 coop that will be 2'6" off the ground. I will put a vent on each end near the top and it will have a 2'x2' window that will open. My question is will this be enough ventilation and is it possible to cut a small hole in the floor (maybe a 6"x6") near a corner and cover with wire to allow air to flow from the bottom. I would fix it so it could be closed during winter months. Thanks for any and all advice.