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Five black 40 mm square PWM fans in a pack

ARCTIC

ARCTIC S4028-6K 5 Pack 40x40x28 mm PWM Fan 250-6000 RPM Black

SKU CH-QTBB-JP5X5

Five 40 mm PWM fans with dual ball bearings, 250-6000 RPM range, 12.06 m³/h airflow and 4.2 mm/H2O static pressure for servers, NAS and compact builds

  • 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 radiators and case intake
  • 40x40x28 mm size fits 1U servers, routers, NAS and small enclosures
  • Standard 4-pin connector works on 2-pin and 3-pin headers with 40 cm cable

Compact 40 mm PWM Fan Pack

This five-pack of ARCTIC S4028-6K fans measures 40x40x28 mm each and runs at 250-6000 RPM via PWM control. Dual ball bearings support durability and resistance to heat and dust. A standard 4-pin connector works with 2-pin or 3-pin headers, and the 40 cm cable eases routing in tight enclosures.

Suits Small Enclosures and 1U Servers

Builders fitting 1U server cases, routers, switches, NAS units, DVRs, Mini PCs, HTPCs, hard-disk enclosures or 3D printers will find the dimensions and pressure curve a direct match. Buyers who need larger frame sizes for standard chassis cooling should look elsewhere.

4.2 mm/H2O Static Pressure

The 4.2 mm/H2O static pressure combined with 12.06 m³/h maximum airflow determines whether this fan can push air through restrictive radiators or dense meshes in your specific build.

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 radiators and case intake
  • 40x40x28 mm size fits 1U servers, routers, NAS and small enclosures
  • Standard 4-pin connector works on 2-pin and 3-pin headers with 40 cm cable

Specifications

No published specifications for this item yet.

Questions about this item

What does the 6000 RPM maximum mean for airflow and pressure inside a case?

At full speed the fan delivers 12.06 m³/h of airflow and 4.2 mm/H₂O of static pressure, a balance suited to both radiator and case use.

How does the 4-pin PWM connector work with 2-pin or 3-pin headers?

The fan plugs into standard 4-pin headers for PWM control and also runs on 2-pin or 3-pin headers using voltage regulation.

Will the 40x40x28 mm size fit a 1U server or router chassis?

Yes, the 40 mm square frame and 28 mm thickness are designed as direct replacements in 1U servers, routers, switches and NAS units.

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