Extruder Fan for Protos!

Fan and under-plate for Protos from GRRF.

I want a Fan from the side and behind the extruder,s o that I can see how printing is going on.

Note:
End-Position should be changed to G28 X30 ; home X axis.

!!!What I didn't found out is where to connect the Fan!!!
I connect it to the other Fans but those should always work!