I am working on a project that will be a 2 story pre-engineered building that will house crypto currency mining machines. The building is as bare bones as it gets. We are passively cooling the building with louvers along the exterior walls and massive exhaust fans on the roof. Think a barn with thousands of computers on racks. We are classifying the building as S-2 but I am not sure how to classify the individual spaces with in the building to determine occupancy. Only a few people are needed to maintain the system and due to the heat generated in the space and the amount of air flow needed to pull it out amount of time in the building will be limited. Any idea on how to classify the space would be a great help.