Dell POWEREDGE M905 - Manual (Page 161)

Installing Enclosure Components
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4 Secure the cable to the power supply with the retention clip by fitting the
retention clip over the cable, and fitting the retention clip tether into the
notch in the power supply handle. See Figure 4-1.
Fan Modules
The M1000e enclosure contains nine hot-pluggable fan modules. All nine fan
modules must be installed at all times to ensure proper cooling.
Removing a Fan Module
NOTICE:
After a fan module is removed from the system, replace it immediately.
1 Identify the failed system fan module using the back-panel fan module
indicators. See Figure 1-12.
2 Remove the fan module:
a Press the fan-module release button. See Figure 4-3.
b Slide the fan module out of the enclosure.