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Small square 4020 case fan with double ball bearing 3.3V-5V

Fans

Fans 4020 4cm double ball A4020B03MO 3.3V-5V case fan

SKU CH-R9A1-2A9G1

A 40 mm case fan with double-ball bearings that runs on 3.3 V to 5 V power

  • Compact 4020 form factor fits tight builds
  • Double ball bearing extends service life
  • Wide 3.3V-5V range suits varied headers
  • 3-pin connector enables speed monitoring

4cm double-ball case fan

The 4020 model fits compact chassis where space is limited. It operates on a 3.3V to 5V supply, making it suitable for low-voltage headers. The double-ball bearing design targets continuous operation in tight builds. Buyers needing higher airflow for larger cases should look elsewhere.

3.3V to 5V voltage range

The wide input range lets the fan run directly from standard motherboard or controller headers without adapters. Double-ball construction reduces wear compared to sleeve alternatives. No PWM signal or speed curve is included, so speed scales with voltage only. Installers who require automatic temperature control must add a separate controller.

Highlights

  • Compact 4020 form factor fits tight builds
  • Double ball bearing extends service life
  • Wide 3.3V-5V range suits varied headers
  • 3-pin connector enables speed monitoring

Specifications

No published specifications for this item yet.

Questions about this item

When will the double ball bearings need replacement?

Double ball bearings typically last longer than sleeve bearings, but exact lifespan depends on operating temperature and duty cycle.

What limits continuous operation at 5V?

Sustained 5V operation increases current draw and heat, which may reduce bearing life over time.

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