Noctua NF-A14 industrialPPC-2000 IP67 PWM Fan (140x140x25mm, 4-pin PWM, 2000rpm max, IP67) Award-winning NF-A14 design 2000rpm industrialPPC version, Custom designed PWM IC with SCD 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