IBM Power Systems RDX Manual page 52

Figure 31. Removing the air baffle from a stand-alone system
3. For a stand-alone system, open the front door by inserting the front door key into the lock as shown
below. Twist the key to the left (counterclockwise) to unlock the door.Horizontal is locked; vertical is
unlocked..
38 Power Systems: RDX docking stations, power cable, and removable disk drives for the 9009-41A, 9009-42A,
or 9223-42H