The Alveo V80 card is designed for passive cooling and require an external mechanism to ensure proper airflow for cooling. The card supports bidirectional airflow which includes normal (forward) airflow direction from retainer bracket to I/O bracket and reverse airflow, as illustrated in the following figure.
CAUTION:
Passive cards should not be powered
without a forced airflow mechanism in place. Ensure that the minimum airflow
requirements are sufficiently met.
Figure 1. Supported Airflow Directions for V80 Card