ReadyNAS Ultra 2 Plus - Which fan is built in?

bbirkhahn wrote:
Hello! I'm looking for a silent replacement fan, which fan is built in? Thanks!

Old thread but the info might be good for someone...

The built-in fan in the Ultra 2 NON-plus is a 92mm Delta AFB0912HH, 12 V / 0.40 A. I would venture a guess that the exact same unit is used in the "plus" version.

Personally I have replaced it with a Noctua NF-B9, which after calibration runs very quiet. In fact, a problem with this is that the system doesn't seem to look at temperature when calibrating, only at maximum fan rotation speed, creating a ramping curve from that. So while the system temperature isn't much affected, the much reduced airflow coming from using a slower speed has seen the CPU temperature rise considerably. Idle temp (sleep mode) is around 70-75 degrees C, when working the temperature is slightly lower.

I am using the Noctua without its speed-reducing resistor cables.

Input on how to manually adjust the calibration would be nice! :)