Fläkt Noiseblocker BlackSilentPro PK2

The Noiseblocker BlackSilentPro PK2 is a 140 mm computer case fan engineered for effective airflow with low acoustic profile. With a maximum speed of 1200 RPM it supplies up to 93 m³/h of airflow while producing only 20 dB of noise. The fan’s compact dimensions (140 × 140 × 25 mm) and matte black finish suit a wide range of PC cases and builds that require quiet, stable cooling. The design combines a glass fibre–reinforced chassis with an anti-dust polycarbonate rotor and advanced drive and bearing technologies to ensure long-term, low-noise operation.

Advantages

The BlackSilentPro PK2 offers a durable NB-EKA Plus II wide-range drive for low impulse noise and extremely low start voltage for reliable starts at reduced voltages. Its NB-NanoSLI bearings provide very low operating noise and extended service life. Installation is vibration-free and tool-less thanks to the NB-Silentframe silicone seal and supplied mounting material. An extendable cable management system with combinable plug-in cables (20 + 50 cm) simplifies routing and integration in different case layouts. Additional electrical protection includes reverse polarity and overload protection plus a restart function for fail-safe operation.

Suitable for

• Silent desktop PCs where low fan noise is a priority
• Home or office workstations requiring unobtrusive cooling
• Compact and mid-tower cases that accept 140 mm fans
• Systems with passive or low-frequency noise profiles

Key specifications

• Fan diameter: 140 mm
• Dimensions: 140 × 140 × 25 mm
• Maximum rotational speed: 1200 RPM
• Maximum airflow: 93 m³/h
• Noise level: 20 dB (maximum)
• Operating voltage reference: 4.5 V
• Colour: Black (matte with mirror finish accents)
• Chassis: Glass fibre–reinforced frame
• Rotor: Anti-dust polycarbonate
• Bearing type: NB-NanoSLI low-noise bearing

How to use

Mount the fan in a compatible 140 mm fan slot in your case using the supplied NB-Silentframe silicone seal and mounting material for tool-less, vibration-free installation. Connect the fan to the appropriate 3- or 4-pin header on your motherboard or fan controller, observing correct polarity. Use the extendable cable management system to route cables neatly; the 20 cm and 50 cm plug-in cables can be combined to reach distant headers. Adjust fan control in BIOS or via software to maintain desired speeds; the fan operates reliably at low voltages thanks to its low start voltage design.

Recommendations

Position the fan to follow your case’s intended airflow (intake or exhaust) and avoid obstructing the rotor with cables. For lowest noise operation, configure the fan curve to limit maximum speed to the level that still provides sufficient cooling for your components. Periodically clean the anti-dust rotor and surrounding chassis to maintain airflow performance and service life.