Noctua SSO2 Bearing, Retail Cooling NF-F12 iPPC 2000 PWM Connector: 4-Pin PWM; NF-F12 industrialPPC-2000 provides a significant performance boost over the 1500rpm retail version. Combined w/ the industrialPPC series' robust polyamide construction & adv. protection features makes the fan ideal for challenging industrial applications. Noctuid's industrialPPC fans feature a three-phase design with 6 slots, which provides smoother transitions between the slots and thus allows for even higher running smoothness, further reduced vibrations and unprecedented energy efficiency. While the standard NF-F12 is one of the most energy efficient 1500rpm 120mm fans on the market, the industrialPPC version's three-phase motor provides a further 10% reduction in power consumption when compared at 2000rpm. Both the impeller & the frame of Noctuid's industrialPPC fans r made entirely fr fiber-glass reinforced polyamide that can withstand temp Thanks to a special varnish coating that covers the motor and PCB, the NF-F12 industrialPPC complies with the ingress protection rating IP52. This means that it is not only highly dust resistant but also withstands dripping water equivalent to 3mm rainfall per minute. Design for pressure demanding appps like heat sinks & radiators, the Focused Flow frame features 11 stator guide vanes that straighten, channel & focus the airflow which allows the NF-F12 to rival the performance of conventional fans running at faster speeds. The NF-F12's stator guide vanes r set out in Varying Angular Distance & feature Vortex-Control Notches. Both measures help to spread the noise emission over a broader frequency spectrum and thus make the fan's sound pattern more agreeable to the human ear. Custom designed for the new Focused Flow frame and to work in tandem with the eleven stator guide vanes, the NF-F12's seven blade Heptaperf impeller has been carefully optimized to achieve a perfect balance between power and quietness.