APS audiophile regenerator

The APS Purepower 1050 I recently added made a dramatic improvement to an already fine system (Aesthetix, Wolcotts, Sound Labs), which previously ran on 3 dedicated lines, but it also added noticable noise from it's cooling fan.

Could you hear the noise at 4 feet?
Is such APS the same as for example the Jeff Rowland Coherence 2 or Dartzeel pre that both uses batterypower?

I got one too, the improvement was really great but yes the fan noise is a problem.
I put it in another room because even from 15 feets i could still hear it.