As mining develops into deeper and hotter regions, the safety and health of miners require that the workspace be cooled. Toward this end, a high-performance, low-maintenance, nominal capacity 5,000-cfm spray cooler was developed. Further, a series of four 25,000-cfm nominal capacity spray coolers were built and mine tested with satisfactory results. The coolers exceeded the desired operational specifications. Although performance degrades slightly with extended use and virtually no maintenance, they operate at satisfactory performance levels under these conditions.