Cutting holes in the exterior walls pretty much out of the question, but I can add a hardware cloth screen to the door. The north wall to the coop divides the shed in half. The back half is the chicken coop, the front half is an overhang with storage space. My venting is in the area of the wall where it joins the ceiling. There is also 2 small open hardware cloth covered windows on the south side.
What is strange, is that the only place I'm finding ammonia buildup is under the roosts. One thing different is that the hens like to hang out on the upper roost during the day so they have the fan blowing on them which means there is a higher degree of poop being dropped under the roosts during the day. The solution may be to discourage the hens from hanging around the coop so much and motivate them outside more.
What is strange, is that the only place I'm finding ammonia buildup is under the roosts. One thing different is that the hens like to hang out on the upper roost during the day so they have the fan blowing on them which means there is a higher degree of poop being dropped under the roosts during the day. The solution may be to discourage the hens from hanging around the coop so much and motivate them outside more.
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