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[CountyV8]

If I got this video right, the 'impeller' is not a moving part, but a kind of an air baffle.

So I assume that this is a finally a variation of a cyclone design. But that's just my understanding.

No I think it is a moving part because ti mentions bearings in the spec

 

[emax]

I had translated 'impeller' with 'ventilator' and concentrated on the thing on the lower part, which is indeed something fixed - hence I overlooked the rotating rake in the top part.

I find a cyclone without moving parts to be a convincing concept. Though they either have good reasons for their own concept or just want to be different: Ball-bearings in an environment whose raison d'être is mainly to be dusty doesn't really convince me.

But perhaps I am missing something.