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There are lots and lots of pics of coops on here, and ventilation is an important consideration so you will often see close-ups of how the ventilation was done. Often the area between the roof and walls, along the rafters, is left open air, maybe covered with hardware cloth for predator protection.
My coop has aa roof that slants to one side onlly. All 4 sides, where the squared off wall did not meet the roof, remain open to the air. Every situation is different, but a general rule to plan from is 1 sq ft of ventilation for each chicken. If you keep the ventilation up high, the air will exchange there, go both in and out, and it normally won't form a draft on the chickens.
You will love having a coop that size, plenty of room for supplies, to move around for chores, and for the chickens when the weather is so bad they want to stay in. I have a lawn chair in my coop and spend time in it most every day. You may want to pen off a small area for a broody to hatch and raise her chicks one day, too; I love mine.
Of course, it also offers room for more chickens.