2020-11-17

Loud Mean Well LRS-350-24 fan

Recently I bought a Mean Well LRS-350-24 AC/DC power supply to drive a decent length of LED strips. It turns out the fan in this power supply is kind of loud - it has only kicked in twice but both occasions I was astonished about the loudness of the fan. A quick Google showed that I'm not alone in this.

I found a site selling an alternative (mirror) but with shipping included it would have cost me $26.45 (and that's with it being on sale and delivery in max. 45 days - ain't nobody got time for that!). The offer is for a 24dB, 12cfm fan. I bet we can do better, cheaper and faster - the holy triangle!

So I set out to find a fan that is:

  • Quieter than the stock 34dB fan, and preferably also quieter than StevesLeds' offer of 24dB
  • Does at least 10cfm
  • Fits (e.g. 60mm, 15mm thick max) and works (12V)

Turns out; there's quite a few if you look around. I settled on a SilentiumPC ZEPHYR 60 (SPC012). Relevant specs are:

  • Size: 60mm x 60mm x 15mm
  • Rated voltage: 12V
  • Rated current: 0.11A
  • Air flow: 10cfm
  • Noise Level: 18.7dB
  • MTBF: 50.000hrs

Sounds like a match to me! So I ordered, paid €4,50 for the fan, €4,50 shipping from a local retailer and received my fan in the mail the next morning. Replacing the fan is a breeze; simply unscrew the cover and unplug the original fan (note the orientation of the plug for the +/- wires! Or better yet: take a photo!)

You can then either:

  • Cut off the connector from the original fan and connect it to your new fan using some electrical tape or, better: a dab of solder and shrink-tube.
  • Cut of the replacement fan's connector. Then remove the white socket gently with pliers (just pull, but carefully) and solder the wires to the pins where the connector used to connect.

You may need to measure / experiment a little which wire is 12V, ground and "tach/signal/sense" on the fan; only 12V and ground need to be hooked up.

Mount the fan on the cover, close the cover and you're done!

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