The FortiGate-5140 chassis must be mounted in a standard 19-inch rack. The chassis
requires 12U of vertical space in the rack.
If you install the FortiGate-5140 chassis in a closed or multi-unit rack assembly, the
operating ambient temperature of the rack environment may be greater than room
ambient temperature. Make sure the operating ambient temperature does not exceed the
manufacturer's maximum rated ambient temperature.

Air flow

For rack installation, make sure that the amount of air flow required for safe operation of
the FortiGate-5140 chassis is not compromised.

Inserting 5000-series modules into a FortiGate-5140 chassis

You can insert FortiGate and FortiSwitch-5000 boards into the FortiGate-5140 chassis.
Arrange the boards in slots as required for your configuration. FortiGate-5000 series
boards can be installed in any FortiGate-5140 slots. FortiSwitch boards can only be
installed in switch slots 1 and 2.
Your FortiGate-5140 chassis may have been shipped with temporary slot filler panels that
include a warning message to read the FortiGate-5000 documentation before installing
your product. The temporary slot fillers must be removed and all slots filled; either with
FortiGate-5000 series boards or with air baffle slot fillers. Air baffle slot fillers are similar to
blank FortiGate-5000 boards and are required for proper cooling air flow.

Note: Mount the FortiGate chassis before connecting power and installing the
FortiGate-5000 series modules.

Caution: The FortiGate-5140 chassis should not be operated as a free-standing appliance.

Caution: Install the FortiGate-5140 chassis at the lower positions in the rack to avoid
making the rack top-heavy and potentially falling over.