Noctua NF-F12 PWM "Focused Flow" Fans
At first glance you don't quite absorb all that went into making the NF-F12 PWM fans, but I will give it my best attempt in the following images to bring forth the features and briefly explain what it does.
In this image I want to address the stepped down corners of the frame on this fan. These are used to ruffle the air as it comes into contact with the outer edge of the fan blades as it enters the fan. These make it so the air passed over and gets picked up by the fans rather than passively sliding through the typical frame.
Each corner, including both sides of the fan, so eight in total, are these rubber anti-vibration pads. They can be simply removed by pulling them out of the frame, but really why would you want this fan to rub and cause noise on something?
After the air gets forced through the Heptaperf impeller the air is then addressed by these eleven stators. Noctua found in the designing that even spacing would deliver more noise, so these are slightly offset in their angles to help keep noise down yet forcing the air through whatever this fan is cooling.
Even with the angles considered, Noctua found a need to notch the stators this time versus the notches we got used to seeing in the fan blades.
The sticker on the back of the fan is actually a thin metal plaque that has been stuck on there. I removed it to see what was underneath of it and I was greeted by the brass outer covering of the SSO2 bearing. Being a sealed system, there will be no maintenance required from the end user.
It was hard to find a good angle to show off the microstructures that are inside of the frame to again disturb the air passing near it to allow the fan blades to scoop it up and force every bit of the flow possible through this fan. Seriously no surface was left untouched in this design.
From the fans frame to the 4-pin connector, there is 7.5 inches of black braided cable to get this fan plugged into the appropriate motherboard header. If you plan to install more than one of these on a cooler like I will be doing, Noctua offers all the wiring you will need to accomplish that as well.