The thing I don't like about this idea is the fact that compressed air will blow a lot of dust outside of the curtain thus creating a health hazard. Just reading Bill Pentz's site at the moment and I'm not sure how to solve this problem.
This is a very good point... Bill Pentz mentions on his site that the amount of dust produced is roughly equal at all sizes i.e. 1/3 of dust created is invisible... so you won't see it collect the next day, but 2/3 is visible, so that means that as ger21 pointed out, if you don't see any dust the next day, you're golden.