A Sunon KDE1204PKV3 40mm fan, 20mm deep, for 12V DC. It is the quiet, low-speed version of this Sunon MagLev fan, a common replacement size in routers, network switches, NAS boxes and small electronics enclosures. It has three wires: red and black for power, and yellow for the speed signal that fan headers use to show RPM.
Specifications
Datasheets
What's in the box
With its three-wire lead and white 3-pin plug fitted. Mounting screws are not included.
Great for
Wiring & getting started
- Check the size and voltage
Measure the old fan: it should be 40 x 40mm, 20mm deep, with holes 32mm apart, and marked 12V. A 10mm-deep fan will not fit the same space.
- Match the wires
Red goes to +12V, black to ground and yellow to the fan header's sense or tach pin. If your device uses a different plug, move the wires across by colour. The yellow wire can be left unconnected.
- Point the airflow the right way
Arrows moulded on the side of the frame show the airflow and rotation direction. Fit it to blow the same way as the fan it replaces.
Note: This is the low-speed version, so it moves less air than the high-speed fans of the same size. If your device came with a KDE1204PKV1 or PKVX, check it can manage with 6.3 CFM before swapping. With no PWM wire, it runs at full speed on a 4-pin PWM header.