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Rack Configuration Considerations

• Standard 19-in. (48.3 cm) 4-post EIA rack with mounting rails that conform to English universal hole

spacing according to section 1 of ANSI/EIA-310-D-1992.

• If you are mounting a chassis in an open rack, make sure that the rack frame does not block the intake

or exhaust ports.

• If your rack includes closing front and rear doors, the doors must have 65 percent open perforated area

evenly distributed from top to bottom to permit adequate airflow.

• Be sure enclosed racks have adequate ventilation. Make sure that the rack is not overly congested as each

chassis generates heat. An enclosed rack should have louvered sides and a fan to provide cooling air.

• In an enclosed rack with a ventilation fan in the top, heat generated by equipment near the bottom of the

rack can be drawn upward and into the intake ports of the equipment above it in the rack. Ensure that

you provide adequate ventilation for equipment at the bottom of the rack.

• Baffles can help to isolate exhaust air from intake air, which also helps to draw cooling air through the

chassis. The best placement of the baffles depends on the airflow patterns in the rack. Experiment with

different arrangements to position the baffles effectively.

Cisco Secure Firewall Management Center 1700, 2700, and 4700 Hardware Installation Guide

Installation Preparation