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Black square 40mm case fan with transparent blades

Fans

Fans W40S12BS4A5-57 4028 40mm 12V .73A case fan

SKU CH-NFY5-H4GAS

A 40 mm square, 28 mm thick 12 V case fan drawing 0.73 A for compact server cooling

  • 12 V power input enables direct server PSU connection
  • 73 A draw delivers strong airflow in a 40 mm frame
  • 28 mm thickness fits standard 1U server chassis
  • Nidec manufacture ensures reliable continuous operation

Compact 40 mm server fan

This 40 mm by 28 mm fan runs on 12 V and draws 0.73 A, making it suitable for tight server chassis or dense networking gear where a slim profile is required. The 4028 form factor fits standard 40 mm mounting holes and targets builders who need focused airflow in restricted spaces.

Limited by small frame and fixed voltage

The 40 mm frame restricts total air volume compared with larger fans, so it cannot cool high heat loads on its own. Operation is tied to a 12 V supply with no speed-control header mentioned, limiting flexibility for builders who want PWM regulation or lower noise at idle.

How it compares

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

Price $8.99
Cheaper than about 92% of the 8,339 comparable items (median $19.99).

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Specifications

No published specifications for this item yet.

Questions about this item

Should I pick the 12V .73A version or a different voltage for my server chassis?

This model is the 12V .73A variant; match it to a 12V header rated for at least 0.73A.

What does the 4028 designation tell me once the fan is installed?

4028 means a 40mm square frame and 28mm thickness, so verify your bay depth before mounting.

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