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Small square 12 V case fan, 40 by 40 by 20 mm, black frame and blades

Fans

Fans FD124020EB 4020 12 V 40×40×20 mm case fan

SKU CH-2HKM-DZX3P

A 40×40×20 mm case fan with double ball bearings running on 12 V

  • Double ball bearing extends service life
  • 12 V input fits standard motherboard headers
  • 40 × 40 × 20 mm footprint suits tight chassis
  • 4020 form factor matches common replacement slots

Compact 40 mm cooling fan

The FD124020EB is a 40 mm square case fan designed for tight spaces in small-form-factor builds or replacement cooling in network equipment. It runs on a standard 12 V supply and uses a double ball bearing for extended operating life.

Practical limits of the 40 mm form factor

The 40 mm frame and 20 mm depth restrict airflow volume compared with larger fans, so it suits targeted spot cooling rather than high-throughput case ventilation. Noise rises at higher speeds because the small blades must spin faster to move equivalent air. Power draw stays modest on the 12 V rail.

How it compares

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

Price $8.99
Cheaper than about 92% 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 choose the 4020 model or a different 12 V fan size?

The 4020 designation means a 40 mm square frame that is 20 mm thick; pick it only if your chassis or heatsink has mounting holes for that exact footprint.

What does the 12 V rating mean once the fan is installed in my PC?

It will run from any standard 12 V fan header or Molex adapter on a desktop motherboard or power supply, drawing its rated current at full speed.

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