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Small black 40mm square case fan with three-pin connector

Sunon

Sunon HA40101V4-0000-C99 40mm case fan 4500 RPM 18.2 dBA Vapo Bearing 3 Pin

SKU CH-WQJV-43HCD MPN HA40101V4-0000-C99

A 40 mm case fan spinning at 4500 RPM with a Vapo bearing, delivering 5.3 CFM at just 18.2 dBA over a 3-pin connector

  • Fan size40 mm
  • Bearing designVapo Bearing
  • Rotational speed4,500 RPM
  • Airflow rate5.3
  • Operating noise18.2 dBA
  • Power input connector3 Pin
  • Vapo bearing extends fan lifespan and reduces friction
  • 2 dBA noise level keeps systems whisper-quiet
  • 4500 RPM delivers 5.3 CFM airflow for tight spaces
  • 40 mm square frame fits compact enclosures and networking gear
  • 3-pin 12 VDC connector supports wide 4.5–13.2 V range

Compact 40mm Cooling Fan

The Sunon HA40101V4-0000-C99 is a 40mm case fan built for tight enclosures and small-form-factor systems. It suits builders who need targeted airflow in spaces where larger fans cannot fit, such as mini-ITX chassis or networking gear.

Three-Pin Voltage Control Limits

The fan connects via a standard three-pin header, so speed is regulated by varying the supply voltage between 4.5 and 13.2 VDC. Without a fourth PWM wire, the motherboard cannot send a dedicated duty-cycle signal, limiting automatic speed curves to voltage-based control only.

Low-Noise Airflow for Confined Spaces

At 4500 RPM the fan delivers 5.3 CFM while producing just 18.2 dBA, a level barely audible at close range. The Vapo bearing and 0.8 W power draw keep it running cool in cramped layouts, but the modest 1.524 mmH₂O static pressure means it struggles against dense heatsink fins or restrictive filters.

How it compares

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

Price $9.99
Cheaper than about 91% of the 8,339 comparable items (median $19.99).
Fan size 40 mm
Lower than about 90% of the 1,114 comparable items (median 120 mm).

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Specifications

Product
Brand nameSUNON
Model nameHA40101V4-0000-C99
Product typeCase Fan
Product colorBlack
Performance
Rotational speed4,500 RPM
Airflow rate5.3
Power
Power input connector3 Pin
Size & build
Fan size40 mm
Bearing designVapo Bearing
Product dimensions1.57 in × 1.57 in × 0.39 in (W × D × H)
Shipping weight0.02 kg
Package size135 × 112 × 29 mm
Environment & compliance
Operating noise18.2 dBA

Questions about this item

How does the 4500 RPM speed translate to actual airflow and noise in a build?

At 4500 RPM the fan moves 5.3 CFM of air while producing only 18.2 dBA, making it one of the quietest 40mm options available.

What does the 3‑pin connector mean for speed control and motherboard compatibility?

The 3‑pin connector provides power and tachometer feedback; speed is adjusted by varying the supply voltage between 4.5 and 13.2 VDC.

Which version of this 40mm fan should I choose if I need the lowest noise?

This single model runs at 4500 RPM with an 18.2 dBA rating, delivering 5.3 CFM airflow and 1.524 mmH₂O static pressure.

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