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Small square 40mm cooling fan with black frame and transparent blades

Sunon

Sunon KD1204PFB2 40mm 1204 DIY Cooling

SKU CH-81TZ-GWMY5

A 40 mm ball-bearing fan spinning at 6500 RPM delivers 7.5 CFM airflow at 29 dBA

  • 40 mm square frame fits tight spaces
  • 6500 RPM ball-bearing motor delivers 7.5 CFM airflow
  • 29 dBA noise level keeps operation quiet
  • 10 mm slim profile suits low-clearance builds

40 mm DIY Cooling Fan

The Sunon KD1204PFB2 is a 40x40x10 mm ball-bearing fan built for custom cooling loops and tight chassis spots. It spins at 6500 RPM and pushes 7.5 CFM while producing 29 dBA of noise. The unit is sold new for builders who need a compact airflow source.

Integration and Clearance

The 40 mm square frame fits standard mounting holes on radiators, heatsinks or small-form-factor cases. Its thin 10 mm profile leaves room for adjacent components and cable routing. The connector type is shown in the product image so you can verify compatibility with your fan header or controller before purchase. Buyers needing higher static pressure or larger airflow volumes should look at bigger frame sizes.

How it compares

Measured against everything we stock in Heatsinks & Water Blocks, at today’s prices. Recalculated every night.

Price $43.99
Pricier than about 76% of the 609 comparable items (median $15.99).

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Specifications

No published specifications for this item yet.

Questions about this item

What is the maximum airflow the 40 mm fan can deliver at 6500 RPM?

The fan moves 7.5 CFM of air at its rated speed of 6500 RPM.

How loud is the ball-bearing fan when it runs continuously at full speed?

It produces 29 dBA, which is a quiet hum suitable for always-on cooling.

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