Enermax D.F. Pressure fans use reverse thrust for dust busting

[ChewieJ]

I think the only real use for these would be as replacements for CPU, or exhaust fans pushing air through radiators to the outside on top mounted rads where you'd want the dust to drop down, and then be picked up and exhausted by a normal rear facing exhaust fan before.

Front mounted fans which are intake fans would work. the question there now is what would be better for preventing dust intake etc.
Case < Fan < Filter (fan reverses blow through the filter to clean it. minimal dust on the fan as its already inside the filtered area)
or
Case < Filter < Fan

[lumireleon]

or a $16 high blast blower which I use for cleaning everything every 6 months

[Ttaskmaster]

Load of tosh, IMO.
My MSI Lightning fans did this and they still got dusty.

Removable blades not such a good idea either, as my older Enermax fans already did that... and broke.
I've also not had a particularly good track record with Enermax fans anyway as, in addition to two removable blade ones going up the duff, I've had a further six just outright kark it.

The ONE interesting thing from that page is the 4.18mm/H2O for 2000rpm at 27dB... That would actually be worth something.

[kalniel]

Simply reversing won't do much to shift static/stuck on dust, you need more of a juddering motion - if fans juddered as they spun up then dust would be dislodged and immediately caught in the normal airflow.

[GoNz0]

Smart used to do this on some of the projectors they sold. In the real world it didn't work and caused it to dump clumps of dust onto components. It cost them a fortune in refurbished units. It turns out kids create a lot of dust in the classroom. They should have fitted filters like virtually all the other manufacturers did.