i don't know exactly where you are, but usually those areas require you to run up a wall and backflip off to a higher point. Look for a wall somewhere with pipes that lead toward the tunnel where the fan is, run up the wall and flip to the pipes, and run across the pipes to the tunnel. --- www.SWGEMU.com....SUPPORT IT!
hold shift to sprint, when you get close to the wall you hit space(jump) which starts you running up the wall, when you get as high as you can, let go of space, it automatically causes you to do a backflip. --- www.SWGEMU.com....SUPPORT IT!