Cisco Nexus 9336PQ - Page 14

The switch must run with all of its power supply and fan modules taking in cooling air from a cold aisle
and exhausting to a hot aisle. If they take in air from the hot aisle, the switch can overheat and shut down.
All power supply and fan modules must use the same direction of airflow.
Caution
Cisco Nexus 9336PQ ACI-Mode Switch Hardware Installation Guide
4
Overview
Power Supply Modules