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Square black 40 mm PWM case fan with four wires

Fans

Fans DS04020R12MP 4020 12V .15A 40x40x20mm case fan

SKU CH-C8V8-S9QT0

A 40 mm square PWM case fan with four-wire speed control, 12 V power and a 20 mm thick frame

  • PWM control enables precise speed adjustment
  • 12 V operation suits standard PC headers
  • 40 x 40 x 20 mm form factor fits tight spaces
  • Four-wire connection supports automated fan curves

40 mm PWM fan for compact builds

The DS04020R12MP is a 12 V case fan measuring 40 by 40 by 20 mm. It draws 0.15 A and uses a four-wire PWM connector for speed control. The small frame fits tight enclosures such as small-form-factor PCs, server blades or embedded appliances.

Limited airflow for low-heat loads

At 40 mm the fan moves less air than larger units, so it suits components with modest thermal output. The PWM interface requires a compatible header; boards without PWM support will run the fan at full speed only. Buyers needing higher static pressure or greater airflow for dense heatsinks should consider larger frame sizes.

Highlights

  • PWM control enables precise speed adjustment
  • 12 V operation suits standard PC headers
  • 40 x 40 x 20 mm form factor fits tight spaces
  • Four-wire connection supports automated fan curves

Specifications

No published specifications for this item yet.

Questions about this item

Should I pick the 40 mm version or a different size?

The DS04020R12MP measures 40 mm by 40 mm by 20 mm, so choose it only when the mounting holes match that exact footprint.

What does the 12 V .15 A rating mean once the fan is installed?

It draws 0.15 A at 12 V, allowing the motherboard PWM header to vary speed precisely without overloading the fan circuit.

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