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elvis:
Avoiding dust is easy.  You need two things:

1) Positive pressure: ie: all airflow in is greater than all airflow out.  If you have negative air pressure (ie: a vacuum) then air starts creeping in from places you don't want.  Make sure to take into consideration dust filters when measuring airflow.

2) Dust filters.  Some fan manufacturers make nice snap-on dust filter gizmos that are easy to remove and clean when they get grubby.  If the fan isn't visible or you don't care about aesthetics, a thin cleaning cloth (we call them "chux" here) can be used as a great cheap disposable dust filter.

Put 1 and 2 together, and your cabs (or computers for that matter) will stay dust free.

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