Fan nozle centered for Hesine i3 (jHead)

I got inspired by the Sunhokey 2015 fan, but due to the different fan position it did not fit on my jHead print head. So I had to learn to use the OpenSCAD and design my own.
Please, feel free to improve it - this is my first thing build using OpenSCAD and I have to say the result has a lot left to desire :(

UPDATE: I had to extend it by further 10mm for the jHead as it was partially touching the heater in my head. Now it is just fine.