Ruffneck Defender heavy-duty explosion-proof thermostats are the smallest, lightest, and most durable thermostats in their class, providing dependable, trouble-free service. They are designed for hazardous location temperature control, such as heating only, cooling only, or ventilation systems in demanding industrial applications, including oil refineries, petrochemical plants, pulp and paper mills, coal mines, grain elevators, hazardous waste storage facilities, and other hazardous locations where specific explosive gases or dusts are present.