I bought these to replace failing fans in an NVR power supply. NVR power supplies are very expensive, if you can find them and it seems silly to replace the NVR just because the fans are failing. These were so quiet, I thought the power supply failed. Since they were so quiet, I replaced the other case fans. The $15 spent on these saved my client $300 for a new power supply or $800 for a new NVR.
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