Does the Fan have an auto-off or power save feature?
The AccuForce does have an automatic power saving mode, but the fan itself is always-on in recent production batches.
We initially went with an off-brand PSU that had a variable fan speed but it didn't have the reliability of the MeanWell PSU, so we ultimately went back to the always-on MeanWell PSU. This has served our customers well from a reliability perspective, but it is a little more audible than we would like. We added an inline power switch when we transitioned to the industrial MeanWell PSU.
To put this in perspective, the cabin noise in a typical luxury car at 50mph is more than 2x greater than the sound level of the AccuForce fan:
Power supplies in some earlier controllers thermally controlled fan speed, but recent fans always run at full speed. FWIW, installing a nominally (2dB) less noisy fan using elastomer fan isolators and cutting away the metal grille helped some (4dB), but it is still the noisiest part of my rig.
My rig is in the garage. I wear over ear, noice cancelling headphones, so the fan noise has never been an issue for me while using it. If I do not cut power to my rig when not in use, I can hear the fan, but it has not caused me to want to swap the fan unit out because of it.