HP HEWLET HP VECTRA VA 6/XXX - Manual (Page 24)

2 How to Install Accessories In Your PC
Removing the Air Flow Guide
14 English
Removing the Air Flow Guide
Your PC has an air flow guide to help reduce the heat of the processor.
You must remove this guide before you can access the processor, the
system board switches, the battery, or any accessory board.
To remove the air flow guide, unclip it from the side of the PC after you
have removed the cover.
NOTE:
The air flow guide on your PC may be
different from the one shown in this
illustration.