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Small square black server fan with visible blades and cable

ARCTIC

ARCTIC S4028-6K 40x40x28 mm Server Fan Black

SKU CH-GREQ-8T8Y0

A compact 40 mm server fan with dual ball bearings, PWM speed control from 250 to 6000 RPM, 4.2 mm/H₂O static pressure and 12.06 m³/h airflow for 1U rack cooling

  • Dual ball bearings extend lifespan and resist heat and dust
  • PWM and voltage control across 250-6000 RPM balances cooling and noise
  • 2 mm/H2O static pressure and 12.06 m³/h airflow suit radiator and case roles
  • Fits 1U server cases, routers, switches, NAS and compact devices
  • Standard 4-pin connector works with 2-pin and 3-pin headers, 40 cm cable aids positioning

Compact Server Cooling Fan

The ARCTIC S4028-6K is a 40x40x28 mm server fan designed for 1U rack environments and small-form-factor devices. It operates on 12 V DC with a 4-pin PWM connector and a 40 cm cable, making it a direct replacement for noisy stock fans in routers, switches, NAS units, DVRs, Mini PCs, HTPCs, hard disk enclosures and 3D printers.

Suited For Tight Spaces And High Static Pressure

This fan suits builders who need strong airflow in a 40 mm frame. Its 4.2 mm/H2O static pressure and 12.06 m³/h maximum airflow handle restrictive radiators and dense chassis layouts. The 250-6000 RPM range allows precise speed control via PWM or voltage regulation. It is not for systems that require larger frame dimensions or higher absolute airflow volumes than this form factor can deliver.

Dual Ball Bearing Impeller For Longevity

The defining specification is the dual ball bearing construction that secures the impeller. This design makes the fan especially durable and less sensitive to heat and dust compared to sleeve bearing alternatives, supporting continuous operation in demanding server and embedded applications.

Highlights

  • Dual ball bearings extend lifespan and resist heat and dust
  • PWM and voltage control across 250-6000 RPM balances cooling and noise
  • 2 mm/H2O static pressure and 12.06 m³/h airflow suit radiator and case roles
  • Fits 1U server cases, routers, switches, NAS and compact devices
  • Standard 4-pin connector works with 2-pin and 3-pin headers, 40 cm cable aids positioning

Specifications

No published specifications for this item yet.

Questions about this item

What comes in the box and does the 4-pin connector need a separate adapter?

The box contains the 40x40x28 mm fan with a 40 cm cable and standard 4-pin connector; it works directly on 2-pin, 3-pin or 4-pin headers so no adapter is required

Should I pick this 6000 RPM model or a slower version for my 1U rack?

This S4028-6K covers 250-6000 RPM via PWM and voltage control, giving a wide range that fits 1U servers, routers, switches and NAS without needing a different model

What does the 4.2 mm/H₂O static pressure mean when the fan is installed in a tight server chassis?

The 4.2 mm/H₂O static pressure and 12.06 m³/h airflow let the fan push air through dense heatsinks or restricted 1U spaces while the dual ball bearings handle heat and dust

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