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Information Junky
Join Date: Mar 2001
Location: an island, upper left coast, USA
Posts: 73,167
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geez, that guy has a PhD in Buzz-words and BS... I mean 'danger of spinning fan blades'? A bladed fan that size could be moving very slowly to match the wimpy flow of those "Aircraft wing, multiplying mixed-flow impeller ...fans"
"buffeting" comes from turbulent flow . . . like you will find when air starts moving fast. ...like from a fan that can move a lot of air.
Jeff's attached vid shows a series of Dyson fans all cranked up ... and how fast does the balloon move? meh.
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Everyone you meet knows something you don't. - - - and a whole bunch of crap that is wrong.
Disclaimer: the above was 2¢ worth.
More information is available as my professional opinion, which is provided for an exorbitant fee. 
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