Acer AR160 F1 - Manual (Page 51)

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2 Place the air duct on the chassis so that the tabs on the air duct
align with the slots on the chassis.
Caution! Do not pinch or unplug cables that may be near or under
the air duct.
Replacing a system fan
The system has five high-performance PWM fans to provide the
cooling for the system. Fan speed may be controlled by a setting in
BIOS (see Chapter 4).
To replace a fan module:
1 Perform the pre-installation instructions described on page 24.
Warning! The system fan becomes very hot when the system is on.
Allow it to cool off first before handling.
2 Remove the top chassis cover while the system is still running to
determine which of the fans has failed.