Thanks. I have the vents close to the floors and am not worried about drafts. The vents are about 4' apart so there is room in between where the ducks can get out of the air flow as well as another three walls. The chickens roost so they are not in the draft area. In addition I will not run...
I put an attic fan on one of the inside walls as high up as I could. On the opposite wall I put three vents close to the floor. The attic fan pulls air through the vents and outside again, providing ventilation. The fan is hooked up to a thermostat and has a manual overide swith incase I want...