http://www.guru3d.com/news-story/ene...ng-design.html

ENERMAX releases D.F. STORM fan, the new flagship 120mm fan which can operate at 3500RPM. The D.F. Storm can generate strong airflow up to 155.08(CFM) and static pressure as high as 11.131(mm-H2O).

Furthermore, the high-speed fan includes the latest DFRTM technology for self-cleaning and the patented APS PWM design, which makes this fan an excellent cooling choice for servers, industrial applications or high-performance gaming rigs.

This super high-speed fan employs the Storm-Flow blades specifically designed to be used under extreme conditions. The solid design and the special shape of the fan blades will ensure low-vibration during operation. Unlike other high-RPM fans using two-ball bearing, D.F. STORM utilizes the ultra-silent Twister Bearing technology to deliver silent operation; moreover; its high-quality and heat-resistant components ensure 160,000 hours MTBF, even at high operating temperature.

D.F. STORM series is built with the patented APS design which provides 3 different speed ranges to satisfy different cooling needs: Performance Mode (1500~2200RPM), Overclocking Mode (1500~2800RPM) and Turbo Mode (1500~3500RPM). With an APS control switch, users can adjust the speed modes much easier; the LED indicator at the back of the fan can reveal the speed mode. Within the selected RPM range, the fan is controlled by pulse width modulation (PWM). The APS design gives users greater flexibility in choosing the preferred fan speed to cool their rigs.

The DFRTM technology can help reduce the dust that gradually builds up throughout the time and extend the intervals for fan?s cleaning and maintenance; this mechanism also helps prolong the product lifetime.