I've had those for a while...not that particular model but a plastic frame that clips onto the fan box...it has a removable foam filter and it sure gets dusty!
Works well for cutting down most of the dust.
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Geeky1University of the Pacific (Stockton, CA, USA)
edited December 2003
Pros:
Looks great
Cons:
Restricts airflow
Doesn't work as well as a foam filter would
Comments
Works well for cutting down most of the dust.
Looks great
Cons:
Restricts airflow
Doesn't work as well as a foam filter would