Requirements Specic to Perforated Cabinets
In addition to the requirements listed in the “General Requirements for Cabinets and Racks” on page 9
section, perforated cabinets with front-to-back airflow must meet the following requirements:
• The front and rear doors must have at least a 60 percent open area perforation pattern, with at least 15
sq. in. (96.7 sq cm) of open area per rack unit of door height.
• We recommend that the roof be perforated with at least 20 percent open area, unless the cabinet only
contains switch, in which case the roof does not have to be perforated.
• We recommend an open or perforated cabinet floor to enhance cooling but it is not required.
Reference Perforated Cabinet
A perforated cabinet that conforms to the above requirements is available from Rittal Corporation:
Rittal Corporation
One Rittal Place
Springfield, OH 45504
Phone: (800) 477-4000
Cabinet P/N: Rittal 9969427
Cabinet description: PS-DK/OEM Cabinet Assembly, 1998 x 600 x 1000 (H x W x D) (42U)
Requirements Specic to Solid-Walled Cabinets
In addition to the requirements listed in the “General Requirements for Cabinets and Racks” on page 9
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 airflow of 849.5 m
3
/h exiting the cabinet roof
through the fan tray, to be available.
• Non-perforated (solid and sealed) front and back doors and side panels to be present so that air travels
predictably from bottom to top.
• The overall cabinet depth to 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 to be available at the floor air intake of the cabinet.
• The lowest piece of equipment to be installed at a minimum of 1 RU (1.75 in. or 4.4 cm) above the floor
openings to prevent blockage of the floor intake.
10
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