I don't measure anything in my coop. I don't think it's necessary. I simply stated that carbondioxide is one of the unwanted gases that vents remove, irrespective of concentrations.
It is very attractive looking.:thumbsup Ventilation, 1 square foot per bird or per 10 square feet of coop space, is non-negotiable. There are three things that need venting out: moisture, CO2 and ammonia. Since your coop is so peaked you will be able to place any vents up high above the roosting...