When the power input voltage is 5v, the fan can be work very quiet and silent, minimal noise ventilation system axial fan with higher air flow to enhance cooling performance. And has passed CE, UL and RoHS certification.

High performance DC brushless fan designed to maximize airflow CFM to noise dBA ratio. Double ball bearings rated at 67,000 hours allows the fans to be laid flat or stand upright.

12V/24V DC energy saving axial cooling system fan is certified by CE, UL and RoHS. Each item will be tested carefully and packed well by professional.  Cooling and Ventilating Solution, Axial force with 43.07 CFM Airflow (max.) Speed 3500RMP (max.) Noise 39dB-A (max.).