9CR-Type Counter Rotating Fans Sanyo Denki 9CR-Type Series Counter Rotating Fans have unprecedented levels of airflow and static pressure. The 9CR-type fans offer several crucial features, including life expectancies ranging from 30,000 hours to 70,000 hours based on the model, a rated voltage of 12V or 48V, an operating temperature range from -10°C to +70°C, and energy-saving characteristics (certain models). Optional features include a locked rotor sensor, a tachometer, or a tachometer with PWM.