Succeeding the vastly successful NF-S12, the NF-S12B is a next generation quiet fan featuring Noctua"s advanced SCD2 technology as well as a highly optimised blade geometry with Bevelled Blade Tips that improves its award-winning predecessor"s airflow efficiency by up to 10%. Topped off with Noctua"s time-tested SSO-Bearing, 6 years warranty and super-slow 700/500 rpm speed settings, the NF-S12B ULN is a premium quality fan for ultra-low-noise applications where maximum quietness has top priority.