My father and I just built my coop and it needs some ventillation for the upcoming winter. Lucky for the girls the weather has been cooperating so they can have their doors open all day. Here are some pictures of the coop for your reference- We will be adding two more windows to the front, steel, and an aviary. I have two air vents from a construction job that my dad and I nabbed up. They are 1ft x 1ft, not really sure if they will work. Thank you for your help!