IBM Power Systems RDX Manual page 61

Figure 40. Replacing the air baffle in a stand-alone system
9. For a stand-alone system, close the front door. Insert the front door key into the lock as shown in
Figure 41 on page 48. Twist the key to the right (clockwise) to lock the door. Horizontal is locked;
vertical is unlocked.
RDX docking stations, removable disk drives, and power cable, for the 9009-41A, 9009-42A, or 9223-42H 47