The Guardian™ CR is designed specifically for use in Class 100 (ISO 5)and higher cleanrooms. It features an inherent balance circuitry, which maintains an ion balance of 0±5V. Ducts enclose the ionizers and each fan is tested for cleanliness to ensure that only clean air exits the unit. The Guardian™ CR has sophisticated internal monitoring circuitry which provides assurance that the unit is ionizing and that the balance circuit is functioning. An outlet allows power supply interconnection (daisy-chain) of units. Power requirement 120VAC, 60Hz.