An Affordable Air Purifier For Dusty Computer Labs?
Panasonic makes some small, effective air purifiers that have filters for odor as well as small particles down to 0.3 microns. I bought the F-P20HU1 for 600 sq ft apartment. Not sure about dust but it's great for seasonal allergies and kitchen odors. Panasonic claims life of 1 yr for odor filters and 3 years for HEPA.
They're only about 6" deep with a front intake and top exhaust so you can push them right against the wall.
List prices in the $199 - $239 range. Check out appliances.com or even better, Froogle for retail pricing.