Requirements Specific to Solid-Walled Cabinets

In addition to the requirements listed in the “General Requirements for Cabinets and Racks” section, solid-walled cabinets must meet the following requirements:

• A roof-mounted fan tray and an air-cooling scheme in which the fan tray pulls air in at the bottom of the cabinet and sends it out from the top, with a minimum of 849.5 m³/h of airflow exiting the cabinet roof through the fan tray, should be available.
• Nonperforated (solid and sealed) front and back doors and side panels should be present so that air travels predictably from bottom to top.
• The overall cabinet depth should be 36 to 42 in. (91.4 to 106.7 cm) to allow the doors to close and to facilitate adequate airflow.
• A minimum of 150 sq. in. (968 sq. cm) of open area should be available at the floor air intake of the cabinet.
• The lowest piece of equipment should be installed at a minimum of 1.75 in. (4.4 cm) above the floor openings to prevent blockage of the floor intake.