Acer Network Device Altos R520 - Manual (Page 121)

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System Acoustic and Performance Configuration
The System Acoustic and Performance Configuration submenu lets you
set the system fan performance option.
Parameter Description Option
Set Fan
Profile Select the Fan Control Profile that
will be used to cool the system. Performance
Acoustics
Altitude When set to less than 300 m
(<= 980 ft), it will provide the best
performance option for servers
operating at or near sea level.
When set to 301m - 900m (980 ft -
2950 ft), it will provide the best
performance option for servers
operating at moderate altitudes
above sea level.
When set to higher than 900m (>2950
ft), it will provide the best
performance option for servers
operating at high elevations above
sea level.
301 m - 900 m
300 m or less
Higher than 900
m