Dusty server room

Anyone have any ideas on what we can do in our server room to cut down on dust? We have a tape backup system that, as of next week, will have been replaced twice because it constantly wants a cleaning (even if we do multiple ones). The culprit, we suspect, is the dusty environment due to us being in a lumber yard. Any thoughts on how we might be able to cut down on the dust that seems to accumulate in there? Would an air purifier do the trick?

 

Might be worth a look here as they seem to do a commercial product
http://www.peakpureair.net/lakeaircom.htm