For trying to reduce dust around all the computers and components, I'm primarily relying upon two GermGuardian AC4825 air cleaning systems in my front office / work area due to having two dogs.
Then the main air cleaning system in the basement server room the past few months has been the Winix WAC5500 True HEPA Air Cleaner.
As a quick update for those after an air cleaner for either your computer equipment or just wishing to eliminate dust, smoke, and other allergens, I continue to be happy with both solutions. The Winix WAC5500 is a powerful beast and is superior to the GermGuardian AC4825 while I am still happy with the GG's performance and lower-cost.
Just this weekend I was changing the filters on the GermGuardian and continued to be amazed by the amount of dust/debris collected in short periods of time.
On Amazon.com you can find the GermGuardian AC4825 for $90 USD and the Winix WAC5500 for $180. Amazon is where I bought both air filters for the best pricing plus I get the replacement filters as part of Subscribe & Save shipments for saving more on those routine costs.