Just to add a little something here with regards to air compressors VS. vacuum cleaners...
compressors don't usually generate static charge in the way that vacuum cleaners (be they "shop-vac" or central) do.
I once messed up one half of a raid 1 array while vacuuming the case. (I unfortunately can't clearly recall how that eventually worked out -- I seem to remember everything functionning after some rebuilding, but...)
Anyway, this is one case where there most definitely is a difference between sucking and blowing. IMHO at least