Ready-to-install, 16-ga. steel, 19-inch W fan panel with universal input voltage (100 to 240Vac) can be used almost anywhere in world. Unit includes UL Listed, universal power supply with three plug adaptors to accommodate outlet requirements in No. America (NEMA 1-15), Central Europe (Schuko CEE 7/16), and U.K. (BS1363). These 2U panels have 3.15-inch (80mm) dia. Fans and include varispeed thermostat probe to automatically activate fans, increasing and decreasing speed as it adjusts to ambient temperature. This power-saving feature ensures efficient fan operation, while saving wear and tear on the unit and minimizing noise.