the good people at case junkies have now translated their article to English themselves:
http://www.casejunkies.com/index.php?up ... 0&page=149
...The fan we have here is Zalman’s own, off course CNPS compliant. The position of the fan blades is also different from your standard fan. They are positioned in a way, not only to create downward airflow, but also through the fins around it.
So it looks like you probably wouldn't want to swap fans out of this, but it sounds like it's a real winner in terms in both quietness and performance.