Noctua FBA_NF-F12 PPC 2000 IP67 industrialPPC-2000 IP67 PWM Fan (120x120x25mm 4-pin PWM, 2000rpm max, IP67) Award-winning NF-F12 design, 2000rpm industrialPPC version, Custom designed PWM IC with SCD Varying Angular Distance and Vortex Control Notches, Heptaperf Impeller Three-phase motor design, Class-leading energy efficiency, Fibre-glass reinforced polyamide construction 6 years manufacturers warranty Certified IP67 water- and dust protection, Flow Acceleration Channels, Inner Surface Microstructures