Noctua NF-F12 industrialPPC 2000 PWM 120mm PC Computer Case Fan Award-winning NF-F12 design, 2000rpm industrialPPC version, Custom designed PWM IC with SCD Varying Angular Distance and Vortex Control Notches, HeptaperfTM Impeller Three-phase motor design, Class-leading energy efficiency, Fibre-glass reinforced polyamide construction Certified IP52 water- and dust protection, Flow Acceleration Channels, Inner Surface Microstructures