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Small square 40mm computer case fan with black frame and four-pin connector

SXDOOL

SXDOOL 40mm 12V PWM case fan 40201B1-Q01C-S99

SKU CH-E1BD-QJ2CW

A 40 mm case fan with 12 V PWM control and dual ball bearings

  • Bearing design2 Ball
  • Power input connector4 Pin
  • Product typeCase Fan
  • Quiet cooling with a 1.28W PWM motor
  • Precise speed control via 4-pin PWM connector
  • Long-life reliability from dual ball bearings
  • Compact 40mm frame fits tight chassis spaces

40 mm 12 V PWM case fan

The SXDOOL 40 mm fan delivers 12 V PWM cooling for compact computer cases and small-form-factor builds. Its 2 ball bearing design supports continuous operation in tight spaces where low noise matters. The four-pin connector enables automatic speed control through the motherboard.

Replaces 40x40x20 mm fixed-speed fans

This unit fits the same 40x40x20 mm footprint as many stock coolers while adding PWM regulation and a 1.28 W power draw. The upgrade is worthwhile when the original fan runs at full speed constantly or uses a sleeve bearing that has become noisy. Buyers needing larger airflow volumes or different mounting hole patterns should look elsewhere.

How it compares

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

Price $7.99
Cheaper than about 93% of the 8,339 comparable items (median $19.99).

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Specifications

Product
Product typeCase Fan
Power
Power input connector4 Pin
Size & build
Bearing design2 Ball

Questions about this item

Will the 40 mm frame fit a standard 40 × 40 mm mounting pattern?

Yes, the fan measures 40 × 40 × 20 mm and uses the common four-hole square pattern for 40 mm case fans.

How do I connect the 4-pin PWM cable correctly?

Plug the 4-pin connector into a motherboard PWM header; the keyed plug prevents reverse insertion, which is the step most often missed.

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