The extra NF-A12x25 LS-PWM fan can be installed in various positions according to your motherboard and installed peripherals.

Taken from the Noctua website "....NF-A12x25 has established itself as a true deluxe choice when it comes to premium-quality quiet 120mm fans. Various state-of-the-art technologies and a record tight tip clearance of only 0.5mm, which is made possible by using the novel Sterrox® liquid-crystal polymer material, allow it to achieve superb results in all types of usage: Whether it’s in low-impedance, airflow-oriented applications such as case cooling, or high-impedance, pressure-demanding scenarios such as on heatsinks and watercooling radiators, the NF-A12x25 is a proven winner. The 4-pin LS-PWM version is a low-speed, PWM-enabled variant that is ideal for semi-passive setups or ultra-low-noise applications that require near-silent acoustics and PWM based speed control. Topped off with exceptional running smoothness, Noctua’s reference-class SSO2 bearing, a rich bundle of accessories and 6-year manufacturer’s warranty, the NF-A12x25 is a premium-quality product through and through. Its superior efficiency, cutting-edge construction and pioneering materials make it an elite choice for the most discerning demands..."

The retail package follows the typical Noctua design with many logos and information at all sides:

The retail package includes:

• NA-RC8 Low-Noise Adaptor (L.N.A)
• NA-YC1 4-pin PWM y-cable
• NA-EC1 30cm extension cable
• 4x NA-AV2 anti-vibration mounts
• NA-AVG1 anti-vibration gasket for water cooling radiators
• Fan screws

The NF-A12x25 LS-PWM is a premium 120mm fan with rotational speed 450~1200rpm (+/- 10%) that produces 12.1db noise and can be further be lowered with the included L.N.A. adapter. With the 0% PWM can be handy to further fine tune performance/acoustic ratio.

With the included bracket, users can install the fan at various positions.

Image showing a possible combination of the extra 120mm fan