Acer Altos G520 series User Manual page 52

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3 Upgrading the system
2 Pull out the air baffle to remove it from the chassis (2).
Caution! After completing the component upgrade/replacement
procedures, do not forget to reinstall the air baffle before
replacing the chassis panels. Failure to do so will reduce the
system's cooling efficiency which can adversely affect
performance or cause damage due to overheating.