One of my clients is a printing company. The paper dust was near impossable to deal with.

Solution Part 1:
We placed 2 negitive ION generators in the printing room with sheet metal plates (earth grounded)on the outer walls. This caused the dust in the air to be attracted to the wall plates and could simply be wiped clean once a week. In 3 week the dust was down 70%.

Solution Part 2:
I used stripping pads(a plastic replcement for steel wool) from 3M, found in the painting area of most hardware stores. One package filters 4 PCs. Placed in front of the fans these are an easily cleaned and re-usable filter.

Total Result: Less dust every were and PC tempurature dropped ending a constant heat problem.