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Black 120mm case fan with ring blade design, 25mm thick, non-LED, 4-pin PWM

Cooler Master

Cooler Master Mobius 120 MFZ-M2NN-21NPK-R1 case fan 120mm 2050rpm

SKU CH-P18N-JSH9J MPN MFZ-M2NN-21NPK-R1

120 mm PWM case fan with loop dynamic bearing, ring blade design and anti-sway system delivers 63.1 CFM at 22.6 dB(A)

  • Fan size120 mm
  • Number of fans1 Fan
  • Fan controlNo Controller
  • Fan depth25 mm
  • Bearing designLoop Dynamic Bearing (LDB)
  • Rotational speed0 to 2050 ± 10% RPM
  • Ring Blade Design eliminates vibration for stable fluid operation
  • Loop Dynamic Bearing with oil reflow extends fan lifespan
  • Anti-Sway magnetic ring prevents shaft tilt and oil spray
  • 1 CFM airflow at 22.6 dB(A) for quiet cooling
  • PWM control up to 2050 RPM suits case and radiator use

Purpose-built cooling

The Cooler Master Mobius 120 is a single 120mm case fan designed for builders who need reliable airflow in a standard mounting position. Its 25mm thickness fits typical chassis, radiator and heatsink clearance without modification. The 4-pin PWM connector allows motherboard speed control from 0 to 2050 RPM. This non-LED black unit suits systems where lighting is not required.

Thermals and acoustics

At maximum speed the fan delivers 63.1CFM while producing 22.6 dB(A), a level suited to quiet workstations or gaming rigs under load. The Loop Dynamic Bearing uses a thick oil coating that continuously reflows to the sealed bearing, reducing friction and extending service life. The Ring Blade Design locks blades together to suppress vibration across the speed range.

Build integration

The Anti-Sway System employs a magnetic ring to stabilise the shaft and prevent blade contact in any orientation, including vertical or side-mounted radiator setups. Angled inner frame rim and chamfered side vents increase static pressure for restricted airflow paths such as dense fin stacks. No external controller is included, so a motherboard header or hub is required for PWM operation.

How it compares

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

Price $22.99
Pricier than about 58% of the 8,339 comparable items (median $19.99).
Fan size 120 mm
Typical for this category: the median of 1,114 items is 120 mm.

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Specifications

Product
Brand nameCOOLER MASTER
Product lineMobius
Model nameMobius 120
Part numberMFZ-M2NN-21NPK-R1
Product typeCase Fan
Product colorBlack
Performance
Rotational speed0 to 2050 ± 10% RPM
Airflow rate63.1CFM
Power
Power input connector4 Pin
Size & build
Fan size120 mm
Number of fans1 Fan
Fan depth25 mm
Bearing designLoop Dynamic Bearing (LDB)
Shipping weight0.27 kg
Package size119 × 119 × 25 mm
Environment & compliance
Operating noise22.6 dB(A)
More details
Fan controlNo Controller
LED lightingNon-LED

Questions about this item

How do I install the Mobius 120 in a 120 mm mounting hole, and what step is often missed?

Align the 120 mm fan with the case or radiator holes, secure with four screws, then plug the 4-pin PWM connector into the motherboard header so the 0~2050 ± 10% RPM curve is active.

What maintenance does the Loop Dynamic Bearing need over its life?

The sealed Loop Dynamic Bearing uses an oil reflow design that continuously lubricates the shaft, so no user maintenance or re-oiling is required.

At what point does the 22.6 dB(A) noise rating stop being accurate during sustained load?

The 22.6 dB(A) figure applies at lower speeds; once the fan ramps toward 2050 rpm under sustained load, audible airflow noise will exceed that rating.

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