NB-Blacknoise Silent Pro 140mm Developed with and for our discerning customers, the new (((NB))) Premium range of fans - equipped with a classical frame and rotor blade - combines the NB-BlackSilentPro series with the latest high-technology in a tried and tested design. The high-quality NB-EKA Plus II drive and the almost noiseless NB-NanoSLI bearings guarantee operating noise levels which are particularly low over the long term - both equipment features which until now have only been used as part of the costlier Multiframe Reference series. In addition to the tasteful design in matte black and mirror finish, the BlackSilentPro fans are equipped with an individually extendable cable management system and an NB-Silentframe silicone seal and installation material for vibration-free assembly without tools. High-quality stable glass fibre-reinforced chassis in a classic design with anti-dust polycarbonate rotor. Cable management system, plug-in cables 20 +50 cm combinable. Vibration-free installation without tools. Extremely low start voltage! Low impulse noise NB-EKAPlus II wide range drive.