The case is the "official" one as mentioned in my previous post.
The fan is a Noctua NF-A4x10-5v (40mm x 10mm - 5 volts). Noise-wise they are rated at 17dB. In fact its so quiet that you have to look at it to see if its actually running. They come with a 6 year warranty. I've been using them in my PC's for years and have not had one fail yet, but this is the first time I have used a 40mm one.
The fan kit has 4 mounting screws, a 2 to 3 pin adaptor, an extension cable, an Omni-join connector set and the rubber anti-vibration mounts. The fan has a 3 pin plug.
The end result...
And here it is running
I had a USB to 3 pin fan header which I used at first. After finding out the correct GPIO pins I used the supplied 2 to 3 pin adaptor and simply plugged the 2 pin end onto the GPIO. Now with the Pi3 running flat out its coming in with temps around 55-56 degrees C (room temp is 27 degrees).
To find out how hot it is; in a terminal window issue the command vcgencmd measure_temp