when you are in the room with all the three fans go to the middle one and go down and you should see a ledge

where is the 'room with fans' and how do i get there?
stjd

The room with the showers is a little more accurate!

Go to the room with the showers and the disassembled shapeship. Where it flies through the back is where the minikit is. You need to remove the grill at the top with a Jedi and use a jumping character to get thru the hole you created. The minikit is across the gap (Use R2 to get across).