Whether it be a fan or a hard drive, sometimes this does the trick. Try duplicating/recording noise to another track and reversing the phase, thereby producing phase cancellation.
What a great buy this console is. Great support and sounds absolutely wonderful and pure. I like a little character, so I combine the Audient with some Neve and API mic pre's with some of my fav compressors, like a Urei 1176LN or SSL FX 384. That's just enough salt & pepper to make my kind of record.
For 5.1 Surround Sound I use the Audient ASP510 controller