Noctua industrialPPC Series Review @ Vortez
 

At the time Noctua announced its redux fans and accessory kits, they also introduced a series of industrial “Protected Performance Cooling” fans. These are “ruggedised high-speed versions” of two of their most promising fans – the 120mm NF-F12 and the 140mm NF-A14.

http://www.vortez.net/review.php?id=923