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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.

How it compares

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

Price $10.99
Cheaper than about 90% 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 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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