HP ZBook 15 Mobile Workstation - Manual (Page 23)

Component Description
(7) Vents (3) Enable airflow to cool internal components.
NOTE: The computer fan starts up automatically
to cool internal components and prevent
overheating. It is normal for the internal fan to cycle
on and off during routine operation.
(8) Service coverr Provides access to the hard drive, and also
contains the wireless LAN (WLAN) module slot,
and the memory module slots.
CAUTION: To prevent an unresponsive system,
replace the wireless module only with a wireless
module authorized for use in the computer by the
governmental agency that regulates wireless
devices in your country or region. If you replace the
module and then receive a warning message,
remove the module to restore computer
functionality, and then contact support.
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