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Black 140mm square case fan with white loop rotor, 29mm thick, 4-pin PWM

Blacknoise

Blacknoise NB-eLoop B14-PS 140mm 4Pin PWM Case Fan 300-1200RPM

SKU CH-GK32-NGNT5

A 140 mm PWM case fan with NANO-SLI bearing running 300-1200 rpm, delivering 83.92 CFM at 24.28 dBA

  • Fan size140 mm
  • Bearing designNANO-SLI
  • Rotational speed300-1,200 rpm Fan speed
  • Airflow rate83.92 CFM Airflow at max speed
  • Operating noise24.28 dBA at max speed
  • Power input connector4 Pin
  • PWM control adjusts 300–1200 rpm for silent or high-flow modes
  • Bionic loop rotor cuts turbulence noise to 24.28 dBA at max speed
  • 92 CFM airflow cools large cases efficiently
  • NANO-SLI bearing protects motor from dust for longer life
  • 140 mm frame with 29 mm depth fits standard mounts

Purpose-built cooling

The Blacknoise NB-eLoop B14-PS is a 140mm case fan designed for system builders who prioritise low acoustic output. Its bionic loop rotor reduces air-stream turbulence while delivering 83.92 CFM at maximum speed. The fan operates between 300 and 1200 rpm, producing 24.28 dBA at peak airflow. A 4-pin PWM connector allows precise speed control through motherboard headers.

Build integration

The unit measures 140 by 140 by 29 millimetres, fitting standard 140mm mounting points in modern chassis. Four-pin PWM control lets the motherboard adjust fan speed automatically based on component temperatures. The NANO-SLI bearing and dust-protected motor reduce maintenance needs in filtered or positive-pressure builds. Non-LED black and white finish suits clean, professional aesthetics without light bleed.

Airflow envelope

At 1200 rpm the fan moves 83.92 CFM, providing ample throughput for mid-range air coolers or moderate radiator stacks. Noise remains at 24.28 dBA even at full speed, keeping the acoustic signature low in quiet environments. The 300 rpm minimum allows near-silent idling when thermal load is light. Builds requiring higher static pressure or greater maximum airflow will need a different solution.

How it compares

Measured against everything we stock in PC Cooling Fans, at today’s prices. Recalculated every night.

Price $30.99
Pricier than about 76% of the 8,339 comparable items (median $19.99).
Fan size 140 mm
Higher than about 80% of the 1,114 comparable items (median 120 mm).

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Specifications

Product
Brand nameAlphacool
Product typeCase Fan
Product colorBlack / White
Performance
Rotational speed300-1,200 rpm Fan speed
Airflow rate83.92 CFM Airflow at max speed
Power
Power input connector4 Pin
Size & build
Fan size140 mm
Bearing designNANO-SLI
Environment & compliance
Operating noise24.28 dBA at max speed
More details
LED lightingNon-LED

Questions about this item

How low can the fan speed drop before it stops?

The PWM control lets the fan run as slowly as 300 rpm, so it can stay nearly silent at idle.

What is the highest noise level the fan reaches at full speed?

At 1200 rpm the fan produces 24.28 dBA, which stays quiet even under sustained load.

Does the fan need a 4-pin PWM header on the motherboard?

Yes, it uses a standard 4-pin PWM connector for speed control and monitoring.

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