Noctua NF-B9 Bevelled Blade Tips with VCN, SSO Bearing Fan_ Retail. Spec. Type : Fan Fan Size : 92 x 92 x25mm Compatibility : CPU Cooler, Water-Cooling Radiator and Case Bearing Type : SSO-Bearing ( Self-stabilising oil-presure bearing ) Blade Geometry : Bevelled Blade Tips Design with VCN RPM +/- 10% : 1600 RPM ( standard ), 1300 RPM ( w/ L.N.A ), 1000RPM ( w/ U.L.N.A.) Air Flow : 64.3m³/h (standard), 52.6m³/h ( w/L.N.A. ), 41.1m³/h ( W/ U.L.N.A ) Acoustical Noise : 17.6 dB(A)/standard, 13.1dB(A)(w/ L.N.A ), 7.9dB(A) ( w/ U.L.N.A.) Input Power : 1.32W / 0.11A Voltage Range : 12V MTBF > 150,000 h. Dimension : 92 x 92x 25 mm. Weight : 0.4Lbs Features : Bevelled Blade Tips Design Vortex-Control Notches Smooth Commutation Drive SSO Bearing ( Self-stabilizing Oil-pressure bearing ) design. Scope of Delivery Ultra-Low-Noise-Adapter ( U.L.N.A) Low-Noise-Adapter ( L.N.A) 4 Vibration Compensators, 3 to 4 Pin Adapter and Screws Warranty : 6 Years.