Acer Altos R910 - Manual (Page 58)

3 System upgrade 48
Installing the system fan assembly
Warning! To ensure proper system cooling, the replacement
of a failed system fan module should be completed within
one minute.
1 If a system fan assembly is installed in the fan bay, perform steps 1
to 3 of the “Removing the system fan assembly” section.
2 Slide the new fan into the fan bay (A).
3 Push the handle closed until it clicks into place (B).