A perforated cabinet has perforations in its front and rear doors and side walls. Perforated cabinets must meet these requirements:

• The front and rear doors must have at least a 60 percent open area perforation pattern, with at least 15 square inches (96.8 square cm) of open area per rack unit of door height.

• The roof should be perforated with at least a 20 percent open area.

• The cabinet floor should be open or perforated to enhance cooling.

The Cisco R Series rack conforms to these requirements.