Our friends at Overclockers Club got their grubby little hands on a couple of Noctua NF-F12 and NF-A14 Industrial PPC fans and promptly put them to the test. Here's a quote from the full review:
You might think that this type of fan would command a premium price, but the pricing is not bad for what you get. The NF-A14 can be found for around $30 and the NF-F12 can be found for around $25. As for the anti-vibration pad and mounts, the pads are around $6 per box of 16 and the mounts are around $8 per box of 20. Most people won't ever have a need for an industrial type of fan, but if you do, then these need to be on your list.