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Black 120mm square frame cooling fan 15mm thick PWM four-pin connector

Alphacool

Alphacool SL-15 PWM Fan 120x120x15mm 600-1800rpm Black

SKU CH-H0YW-BBDSR

Slim 120 mm PWM fan spins 600–1800 rpm with double ball bearings for quiet liquid-cooling radiators

  • ColorBlack
  • FeaturesThe Alphacool ES fans have been specially developed for use
  • Precise speed control via 4-pin PWM connector
  • Wide 600-1800 rpm range for flexible cooling
  • Double ball bearings extend service life under load
  • Protection circuits stop fan automatically if blocked
  • Slim 120 x 120 x 15 mm profile fits tight spaces

Compact 120 mm PWM fan

The Alphacool SL-15 is a 120 x 120 x 15 mm fan with 4-pin PWM control and a 600–1800 rpm range. It is built for liquid-cooling radiators in servers and workstations where space is limited. The black frame suits low-profile builds that need precise speed regulation.

Sustained-load behaviour

Double ball bearings keep vibration low and service life high during continuous operation at full speed. Protection circuits stop the motor automatically if the blades are blocked, preventing damage in dense rack environments. Soft-start reduces mechanical stress on every spin-up cycle.

Upgrade path and fit

This fan replaces 3-pin or voltage-controlled 120 mm units that cannot reach zero rpm or offer the same bearing durability. The jump is worth it when a server mainboard supports 4-pin PWM and the chassis accepts a 15 mm thickness. Builders needing 25 mm frames or higher static pressure must look elsewhere.

Highlights

  • Precise speed control via 4-pin PWM connector
  • Wide 600-1800 rpm range for flexible cooling
  • Double ball bearings extend service life under load
  • Protection circuits stop fan automatically if blocked
  • Slim 120 x 120 x 15 mm profile fits tight spaces

Specifications

BrandAlphacool
Model4250197248297
ColorBlack
FeaturesThe Alphacool ES fans have been specially developed for use in servers and workstations and, unlike usual, do not offer a 2 or 3-pin DC power connection, but a 4-pin PWM control.

Questions about this item

How much noise and heat does the 120 mm SL-15 PWM fan produce when running continuously at 1800 rpm?

The fan spins between 600 and 1800 rpm using a double ball bearing for smooth, low-vibration operation; its 4-pin PWM control lets the motherboard lower speed under light load, reducing both noise and power draw over a full day.

What motherboard header or controller is required to run the 4-pin PWM connector on this Alphacool fan?

A standard 4-pin PWM header supplying 12 V is needed; the fan receives full voltage at all times and is regulated by the PWM signal, so a 3-pin DC header will not provide speed control.

Will the 120x120x15 mm SL-15 fit alongside my existing 80 mm fans in the same chassis?

Yes — the SL-15 uses the common 120 mm square frame and 15 mm thickness, while your 80 mm fans occupy the smaller 80 x 80 x 25 mm footprint, so both can coexist if the case has mounting points for each size.

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