Dual DC Fans The dual DC fans meet the low-noise, energy-saving and high-reliability requirements Utilizing Intelligent Constant Air Speed Design to Monitor the Downward Airflow and the Inlet Airflow in Real-Time. The dual air speed sensors adjust the fan speed through a microcomputer system so as to maintain constant air speed inside the cabinet Adopting Ultralow Penetration Air Filters (ULPA) Ensuring a cleanness grade conforming to Class 1 of the American standard and using pressure sensors to monitor the service life of the filters in real-time to ensure superior accuracy and efficiency Adopting an Intelligent Interlock Design to Avoid the Risk of Disoperation.