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Small square 40 by 40 by 20 mm case fan with black frame and transparent blades

CAFELE

CAFELE KF0420S5H-R 40x40x20mm case fan

SKU CH-X8Y6-RRAAK MPN KF0420S5H-R

Compact 40×40×20 mm case fan running at 5 V and 1.3 W for tight builds

  • Product typeCase Fan
  • Compact 40×40×20 mm frame fits tight builds
  • 5 V DC supply simplifies low-voltage wiring
  • 3 W draw keeps power use minimal
  • JAMICON motor engineered for reliable airflow
  • 2-wire switch design enables straightforward speed control

Compact 40mm Cooling Fan

The CAFELE KF0420S5H-R is a 40x40x20mm case fan designed for tight spaces in small-form-factor builds or industrial enclosures. It runs on 5V DC and draws 1.3W, making it suitable for low-voltage headers or external 5V sources. The two-wire switch design provides basic on-off operation without speed reporting.

Simple Two-Wire Installation

Connect the two leads to a 5V fan header or a compatible power adapter; no PWM signal or tachometer wire is present. The 20mm thickness fits standard 4020 mounting holes, but the lack of a third wire means the motherboard cannot monitor rpm or adjust speed automatically. Verify polarity before powering to avoid damage.

Fixed-Speed 5V Operation

Because the fan uses a two-wire 5V interface, it runs at a constant speed whenever powered and cannot be regulated by BIOS or software fan curves. This limits its use to scenarios where steady airflow is acceptable and noise levels at full voltage are tolerable. Builders needing variable speed or speed feedback should choose a three- or four-wire alternative.

How it compares

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

Price $32.99
Pricier than about 80% of the 8,339 comparable items (median $19.99).

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Specifications

Product
Product typeCase Fan

Questions about this item

How can I confirm the 40x40x20mm fan is running correctly after connecting it to a 5V header?

The fan should spin smoothly and move air through the 40mm frame; a steady current draw near 1.3W at 5V indicates normal operation.

What comes in the box with the KF0420S5H-R and what must I source separately?

The package contains the 40x40x20mm two-wire fan only; mounting screws, a 5V power header or adapter, and any fan-speed controller are not included.

Which version of the 40mm 5V fan should I choose for a 1.3W power budget?

The KF0420S5H-R is the single 5V 1.3W model listed; no alternative voltage or wattage variants are offered for this frame size.

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