Noctua Fan with Focused Flow and SSO2 Bearing Retail Cooling NF-F12 iPPC 3000 PWM Running twice as fast as the 1500rpm retail version, the NF-F12 industrialPPC-3000 PWM provides extreme airflow and pressure performance Combined with the industrial PPC series' robust polyamide construction and advanced protection features, this makes the fan ideal for challenging industrial applications. While the standard NF-F12 is one of the most energy efficient 1500rpm 120mm fans on the market, the industrial PPC version's three-phase motor provides a further 10% reduction in power consumption when compared at 2000rpm. Both the impeller and the frame of Noctua's industrial PPC fans are made entirely from fiber-glass reinforced polyamide which can withstand temp. up to 140 DegreeC and makes the fans more robust and break-proof A special varnish coating that covers the motor and PCB, the NF-F12 industrial PPC complies with the ingress protection rating IP52 means that it is not only highly dust resistant but also withstands dripping water equivalent to 3mm rainfall per minute.