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This article is the final part of the story titled Replacing a 40 x 20 mm, 5V Fan for a 3Com Baseline Switch 2928-SFP Plus . I chose the Noctua NF-A4x20 5V, Premium Quiet Fan, 3-Pin, 5V Version ( affiliate link ) after I learned that these fans are high quality and very quiet. Noctua makes both 12V and 5V fans. The company also offers 3 and 4 wire variations for each. You need the 5V, 3-wire version for the 3Com Baseline Switch. I had a bad experience with Amazon's customer service when I tried to return the 12V version of this fan. Read about it here . The Noctua kit is well designed. It has a lot of parts to suit any situation you might face. I will only focus on the parts I used for this project. The fan connector on the 3Com is proprietary. I used the OmniJoin adapters that came with Noctua to connect the fan to the 3Com connector. I cut off the connector from the old fan and the connector from the Noctua fan. Each pair of wires (Black-Black, Red-Red, White-Yellow)...

The fan on the above switch was on its last leg.  The Fan dimensions are 40x40x20mm. It is a 5V fan. I am looking for a replacement. The photos allow anyone with a similar fan to comment and suggest a replacement. I am considering the Noctua NF-A4x20 5V, Premium Quiet Fan, 3-Pin, 5V Version (40x20mm, Brown)  and would appreciate if anyone could confirm whether they have managed to get this model to work and what how they paired the wires of the Noctua to the red, white and black wires of the 3Com fan. If anyone has used another brand please share model and link. Important that the fan is quite and good quality . And if you're curious about what a dying 40 x 40 x 20 mm fan sound like, click below Information about the unit The Failing Fan Model: EFB0405MD Manufacturer: Delta Electronics Inc. The Mainboard / Power The Fan Connector / Motherboard Motherboard Motherboard w/Plug (Clip side) The Fan Connector Follow This, That and (Maybe) , the Other ...