TC wrote:

> 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<.

A fan pushes air forwards by using flat blades to fan it. An impeller 
pushes air *outwards* by centrifugal force. That's an entirely different 
mode of action. (Although of course impellers aren't exactly new either.)

What _is_ new is that by using clever air currents, you can make the 
draft much bigger with less effort. And I guess it looks kinda neato.

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

 From what little I've seen, fans tend to get dusty when they're not in 
use, because they're exposed to the air. An impeller, by definition, is 
internal. When it's not running, there's very little air to get it dusty.

Still, at the end of the day, if you don't like it, don't buy one. :-)

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