The other is directly across on the back wall. The vent are high enough to prevent a draft on the birds when roosting, but allows for air exchange. A window was also cut in the door. This allows us to look in at the birds without having to open the door. Both vents and the window in the door are covered with wire cloth.
Clear plastic is placed on both windows during the winter.
The vents are left uncovered, for air exchange during the winter. All plastic is removed for the summer. Once the house is done it needs to be furnished. On these nail whatever is going to be used for the roost. Just inside the door, on the front wall nail the nests.