Since sub-assemblies are created in a factory-controlled environment using dry materials, there is less risk for moisture, environmental hazards, and dirt-related problems. This ensures that those who are on the job site as well as the final tenants of a project are less likely to be exposed to air-related health risks. In addition, an internal construction environment presents significantly less risk for accidents and other obligations. There are strict factory processes and procedures that protect the worker from injury at work. In a construction site, although safety is the highest priority, workers are exposed to weather conditions, changing ground conditions, wind and other team members on site.