Cisco GoQAM Installation And Operation Manual page 39

Stacking Guidelines
Option 2 – Using a Rack With Floor Plenum Forced Air Cooling
This stacking option also uses a 40 RU configuration containing up to 32 GoQAMs.
In Option 2, however, the lower 4 RU space is covered with a solid panel instead of a
vented one. The upper 4 RU space is vented along with the entire top of the rack.
The floor plenum forced airflow must also be a minimum of 600 cfm with 2000 cfm
being the ideal amount.
Example:
4004834 Rev D 23