HP EliteBook Folio 1040 G1 Notebook PC - Manual (Page 22)

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Component Description
(1) Docking device receptors (2) Connects an optional docking device.
(2) Vents (2) 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.
12 Chapter 2 Getting to know your computer