> It doesn't have blades; it uses an impeller. And although I can't recall 
> the name for it now, I've seen a device similar to this that passively 
> accelerates airflow.

I don't have much doubt that the shape of the ring actually amplifies 
airflow. And airflow is probably not as chopped up.

However, I think that there is small functional difference between a 
fan-blade and what is used in the impeller. It all boils down to rotating 
structures pusing air molecules forward. I expected something >new<.

And I really doubt that cleaning the impeller is easier than cleaning a fan.

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