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Cisco 12006 and Cisco 12406 Router Installation and Configuration Guide
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Chapter 2 Preparing for Installation
Site Requirement Guidelines
in the rack. Ensure that cables from other equipment do not impair access to
the card cages, requiring you to disconnect cables unnecessarily to perform
equipment maintenance or upgrades.
Ventilation
The blower module is mounted at the rear of the chassis; air flow to the air filters
and blower module should not be blocked.
Note Warm air is exhausted from the rear of the chassis. Maintain 6 inches (15.24 cm)
of clearance at both the inlet and exhaust openings on the chassis to allow
sufficient air flow.
• When placing multiple Cisco 12006 and Cisco 12406 Routers in the same
rack, ensure that there is sufficient ventilation to accommodate the routers.
• Equipment located near the bottom of the rack can generate excessive heat
that is drawn upward and into the intake ports of equipment above, possibly
leading to overheating.
• The heated exhaust air from other equipment can enter the inlet air vents and
cause overheating inside the router.
• A ventilation system that is too powerful in an enclosed rack can also prevent
cooling by creating negative air pressure around the chassis and redirecting
the air away from the air intake vent. If necessary, operate the router with the
rack door open or in an open rack.
• The correct use of baffles inside an enclosed rack can assist in cooling the
router.