Featuring advanced aerodynamic design measures such as Flow Acceleration Channels and Noctua"s AAO frame, the NF-A4x10 is a highly optimized, premium quality quiet fan in 40x10mm size. Smooth Commutation Drive technology and Noctua"s reference class SSO2 bearings guarantee superb running smoothness and excellent long-term stability. Topped off with modular cabling, a Low-Noise Adaptor and Omni Join Adaptor Set as well as 6 years manufacturer"s warranty, the NF-A4x10 is a premium choice for the highest demands.