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Small black square 40mm case fan with dual ball bearing and stall alarm wire

Fans

Fans EFB0405HHD 4020 5V .45A 40x40x20mm stall alarm dual ball bearing case fan

SKU CH-BN0V-9S179

40×40×20 mm 5 V dual ball-bearing case fan with stall alarm

  • Stall alarm signals failure before overheating occurs
  • Dual ball bearing design extends operational lifespan
  • 5 V 0.45 A draws minimal system power
  • Compact 40 × 40 × 20 mm fits tight chassis spaces

Compact 4020 5V case fan

The EFB0405HHD is a 40 mm square frame fan that runs on 5 V and draws 0.45 A. It uses dual ball bearings and includes a stall alarm signal for monitoring. The 20 mm thick design fits the standard 4020 mounting pattern.

Small-form-factor builders needing 5 V operation

This fan suits tight enclosures that require a 5 V supply and a tachometer-style alarm. Systems that demand PWM control, higher voltage input or larger frame dimensions will need a different cooling solution.

How it compares

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

Price $13.99
Cheaper than about 70% 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

How long will the dual ball bearings last before replacement?

Dual ball bearings typically outlast sleeve bearings by several years under continuous operation, reducing the need for early replacement.

What limits sustained performance first — airflow or stall protection?

The stall alarm triggers when rotor speed drops below a safe threshold, protecting the motor before airflow loss becomes critical.

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