Yes the green 6pin connecter beside the battery tray is the perfect switched source for an Efan install. I do suggest using a relay with the install as well, as Ive had one relay blow on me and not take anything else with it and just replaced it and went on my merry way.
The pin you want to use on this connecter btw is the middle pinout near the 'lock' of the plug (usually the thingy you depress to release plugs from each other) as shown in this picture (on my own car btw)
