Challenge: When fresh air exchange is poor, machine shops are known for exposing occupants to chemicals, oils, solvents, hotter ambient air temperatures, and sometimes humidity. This typical screw machine shop turns long bars into custom parts. The oil-based coolants necessary for running the machines exposed employees’ senses to oily, heavy, stagnant air—to the point where the shop sometimes took on a haze. The smell and discomfort grew worse throughout the day. This shop needed a cost-effective solution for improving air quality and thermal comfort pronto.