Lenovo ThinkSystem Rear Door Heat eXchanger V2 User Manual page 16

Step 7. Remove the four screws that secure the cable access bar, and remove the bar.
Figure 12. Removing the cable access bar
Step 8. Align the lower air baffle to the bottom cable slot, and secure it with four screws as illustrated.
Figure 13. Installing the lower air baffle
Step 9. Secure the bottom hinge assembly to the rack cabinet with eight screws.
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ThinkSystem Rear Door Heat eXchanger V2 User Guide