They talk about back pressure in this interview and basically say that it can produce enough pressure to pull air through a filter that would keep dust out. https://www.youtube.com/watch?v=YGxTnGEAx3E

Dumb question, but wouldn't the filter just end up getting clogged instead?

First bigger surface area two you can run it backwards each time you power it on and the filter increases time between automatic cleaning and helps with dusty environments.

I don't think this solid state fan can be run backwards, if I'm understanding how it works correctly

Can you clarify? I'm not sure this addresses the parent poster's concerns.

To add, I'm wondering about the susceptibility of such a system to the use of things like compressed air. High-velocity particulate + tiny spaces = potential for jamming/destruction of the components?