IBM Rear Door Heat eXchanger V2 Installation And Maintenance Manual page 41

5. Remove the cardboard top from the heat exchanger carton.
Figure 17. Removing the cardboard top from the heat exchanger carton
6. Remove the parts and tools from the carton and set them near the rack. Do
not unpack the heat exchanger until later in the procedure.
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Chapter 4. Installing the heat exchanger