Cisco Catalyst 9400 Series Hardware Installation Manual page 35

Preparing for Installation
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If you are installing your switch in an enclosed or partially enclosed rack, we strongly recommend that you
verify that your site meets the following guidelines:
• Verify that there is a minimum of 6 inches (15 cm) of clearance between the sides, front, and back of
any enclosure, and both the chassis air intake grill and the chassis air exhaust grill along with the power
supply unit intakes and exhausts.
Do not use fully closed cabinets or open racks with solid side panels, unless they meet the 6 inch clearance
requirements with respect to chassis intake and exhaust vents, or unless the sides incorporate sufficient
venting holes.
The upright columns of a relay rack may have less than the recommended side spacing - provided there
are substantial cut-outs, holes, or vents in the structure to allow adequate air flow through the chassis.
For two-post racks with solid uprights, the recommended maximum column depth for unrestricted air
flow is 5 inches (13 cms) for a 23-inch rack and 4 inches (10 cms) for a 19-inch rack.
• Verify that the ambient air temperature within the enclosed or partially enclosed rack is within the chassis
operating temperature limits. After installing the chassis in the rack, power up the chassis and allow the
chassis temperature to stabilize (approximately 2 hours).
Measure the ambient air temperature at the chassis air intake grill by positioning an external temperature
probe 1 inch (2.5 cm) away from the chassis left side, and centered on the chassis both horizontally and
vertically.
Chassis air intake
Chassis air exhaust
3 Power supply air intake
4 Power supply air exhaust
Cisco Catalyst 9400 Series Switches Hardware Installation Guide
Air Flow
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