Ok, lets say as an experiment, now I don't advise doing this but, sweep up a bit of road dirt like you would find on the center line of a two lane city street and sprinkle it in front of the opening where the 'filter' is, I bet money a bunch of that crap gets sucked into that expensive hair dryer you got there. And where is it going?
Example, I know of a street driven Roush mustang with a blower and a 10 micron screen, it has 30k on the clock and the cylinder walls looked like someone used 300 grit sand paper on the cylinder walls, piston sides and the blower needed rebuilt.
All I'm saying is I would put a real filter on that thing that's all,