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Small black square 40mm PWM case fan with four wires

Fans

Fans MC40201V2-Q000-S99 4020 12V 0.9W 4-wire PWM case fan 40x40x20mm

SKU CH-GF00-MMS4Y

12 V 0.9 W PWM case fan fits 40 mm square by 20 mm deep slots

  • Precise speed control via 4-wire PWM
  • Low 0.9 W draw keeps system power down
  • Compact 40×40×20 mm fits tight spaces
  • 12 V operation matches standard PC headers

Compact 40 mm PWM case fan

The SUNON MC40201V2-Q000-S99 is a 40 mm square case fan designed for tight spaces in compact builds. It runs on 12 V power and draws 0.9 W through a four-wire PWM connection for speed control. The 20 mm thickness suits shallow chassis and small-form-factor enclosures. Buyers needing larger airflow or quieter operation at low RPM should look at bigger frame sizes.

Four-wire PWM integration

The fan connects to a standard four-pin PWM header on the motherboard or fan controller for automatic speed regulation. Its 12 V input matches typical desktop headers without extra adapters. The slim 20 mm profile leaves clearance for nearby components or cable routing. Builds without a PWM header or with only three-pin voltage control cannot use the speed-signal wire.

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

How much power does the 0.9 W motor draw during continuous PWM operation?

The fan is rated at 0.9 W at 12 V, so sustained PWM running will not exceed that power level.

What noise and heat output can I expect when the 40×40×20 mm fan runs all day at full speed?

At 0.9 W the 12 V motor produces minimal heat, and the 4-wire PWM control lets the system lower speed to keep noise down during extended use.

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