Paul, this has been a common question I have seen, especially in older and/or leased GMP warehouses. I agree with all the points that you and "D" discuss. I expand based on situations that I have encountered more than once. Older facilities generally have a lack of airflow/velocity, especially if they are going >4 racks high. There are fans of various designs that will effectively alleviate this type of design issue. Just wanted to share some insights with your contact. Thank you.