Succeeding the awardwinning NFB9
Noctua?s NFB9 fan has become a defaultchoice among PC enthusiasts looking for a premium
quality quiet 92mm fan. Thanks to its thoroughgoing aerodynamic optimisations the NFA9
provides higher static pressure and an even better airflow/noise ratio than its much acclaimed
Flow Acceleration Channels
The NFA9 impeller features suction side Flow Acceleration Channels. By speeding up the
airflow at the crucial outer blade regions this measure reduces suction side flow separation
and thus leads to better efficiency and lower vortex noise.
Noctua?s AAO Advanced Acoustic Optimisation frames feature integrated antivibration pads
as well as Noctua?s proprietary Stepped Inlet Design and Inner Surface Microstructures both of
which further refine the fan?s performance/noise efficiency.
Stepped Inlet Design
Noctua?s Stepped Inlet Design adds turbulence to the influx in order to facilitate the transition
from laminar flow to turbulent flow which reduces tonal intake noise improves flow attachment
and increases suction capacity especially in space restricted environments.
Innner Surface Microstructures
With the tips of the fan blades ploughing through the boundary layer created by the Inner Surface
Microstructures flow separation from the suction side of the blades is significantly suppressed
which results in reduced blade passing noise and improved airflow and pressure efficiency.
The NFA9 PWM is supplied with a LowNoise Adaptor L.N.A. that reduces the maximum fan
speed from 2000 to 1550rpm. The L.N.A can be used either to run the fan at a fixed speed of
1550rpm or to cap the maximum speed when using automatic PWM control.
The NFA9 features the further optimised second generation of Noctua?s renowned timetested
SSO bearing. With SSO2 the rear magnet is placed closer to the axis to provide even better
stabilisation precision and durability.
Custom designed PWM IC with SCD
Supporting fully automatic PWM speed control the NFA9 PWM uses Noctua?s custom
designed NEFD1 PWM IC that integrates Smooth Commutation Drive SCD technology.
By providing smoother torque impulses SCD suppresses PWM switching noises and thus
makes the fan quieter at low speeds.
Extensive cabling options
The fan?s short 20cm primary cable minimises cable clutter in typical applications while
the supplied 30cm extension provides extended reach when necessary. Both cables are
fully sleeved and a 4pin ycable allows to connect a second fan to the same PWM fan
header for automatic control.
Integrated AntiVibration Pads
Integrated AntiVibration Pads made from extrasoft silicone minimise the transmission
of minute vibrations while maintaining full compatibility with all standard screws and
other mounting systems.