Cooling Air Flow And Required Minimum Air Flow Clearance - Fortinet FortiGate-7000E Series System Manual

FortiGate-7040E chassis
The other fan trays will continue to operate and cool the chassis as a fan tray is being removed and replaced. However
an open fan tray slot will result in less air flow through the chassis so do not delay installing the replacement fan tray.
The FortiGate-7040E management module monitors the internal temperature of the chassis and adjusts the operating
speed of the cooling fans as required. When the chassis is first powered on all cooling fans run at full speed. Once the
management module is up and running, the management module reduces cooling fan speeds to maintain an optimum
temperature in the chassis. If the management module is not installed or is not operating correctly the FortiGate-7040E
chassis cooling fans always operate at full speed.
During normal operation, all fan trays are active. If cooling requirements increase, the fan speed will increase.
Cooling fan tray and outlet cover
Retention
Screw
Outlet
Grill
Outlet
Grill
Retention
Screw

Cooling air flow and required minimum air flow clearance

When installing the chassis, make sure there is enough clearance for effective cooling air flow
shows the cooling air flow through the chassis and the locations of fan trays. Make sure the cooling air intake and warm
air exhaust openings are not blocked by cables or rack construction because this could result in cooling performance
reduction and possible overheating and component damage.
Most cool air enters the chassis through the chassis front panel and all warm air exhausts out the back. For optimal
cooling allow 100 mm of clearance at the front and back of the chassis and 50 mm of clearance at the sides. Under
these conditions 80% of cooling air comes from the front panel air intake and 20% from the left and right side panels
and 100% exits out the back. Side clearance is optional and chassis cooling will be sufficient if no side clearance is
available.
FortiGate-7040E System Guide
Fan Tray
Retention
Screw
Fan
LED
Fan
LED
Retention
Screw
Outlet Cover
. The following diagram
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