Noctua NF-A14 iPPC-2000 IP67 PWM, 140mm 4-Pin Heavy Duty Cooling Fan with 2000RPM and IP67 (Black) Award-winning 140x25mm A-series fan with Flow Acceleration Channels and Advanced Acoustic Optimisation frame for superior cooling efficiency High-speed industrialPPC version for industrial heavy-duty applications that require extreme cooling performance and advanced ingress protection 12V 2000rpm model (31.5dB) with 4-pin PWM connector for automatic speed control via 4-pin PWM fan headers, broad 500-2000rpm speed range Ruggedised fibre-glass reinforced polyamide construction and IP67 certified water and dust protection Trusted Noctua quality with premium-grade SSO2 bearing and more than 150.000 hours MTTF. NF-A14 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-A14 is one of the most energy efficient 1500rpm 140mm 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. The motor and PCB of the IP67 version are completely cast in a special, highly heat conductive resin that combines thoroughgoing protection and effective motor heat dissipation. Complying with the ingress protection rating IP67, this fan is not only fully dust tight but also completely waterproof up to 1m water depth. The NF-A14 impeller features suction side Flow Acceleration Channels. By speeding up the airflow at the crucial outer blade regions, this measure reduces suction side flow separation and thus leads to better efficiency and lower vortex noise.