The UL3422 card is designed for passive cooling and requires an external mechanism to ensure proper airflow for cooling. The card supports normal (forward) airflow direction from retainer bracket to I/O bracket, as illustrated in the following figure. Passive cards should not be powered without a forced airflow mechanism in place.
Figure 1. Supported Airflow Directions for UL3422 Card
Note: Other
environmental conditions are possible, including bidirectional flow. However, this
is specific to server configurations, and testing is performed by individual OEMs.
Contact your server provider for more information and options.