Cisco Nexus 93180YC-FX Hardware Installation page 21

Preparing the Site
Clearance Requirements
4 Width of the front clearance area (equal to the
width of the chassis with two rack-mount
brackets that are attached to it).
Note Both the front and rear of the chassis must be open to both aisles for airflow.
Cisco Nexus 93180YC-FX ACI-Mode Switch Hardware Installation Guide
11