• Electrical equipment generates heat. Ambient air temperature might not be adequate to cool equipment
to acceptable operating temperatures without adequate circulation. Make sure that the room in which
you operate your system has adequate air circulation.
• Ensure that the chassis cover is secure. The chassis is designed to allow cooling air to flow effectively
within it. An open chassis allows air leaks, which may interrupt and redirect the flow of cooling air from
the internal components.
• Always follow ESD prevention procedures to avoid damage to equipment. Damage from static discharge
can cause immediate or intermittent equipment failure.
Power Supply Considerations
See Power Supply Module, on page 24 for more detailed information about the power supply in the chassis.
When installing the chassis, consider the following:
• Check the power at the site before installing the chassis to ensure that it is free of spikes and noise. Install
a power conditioner, if necessary, to ensure proper voltages and power levels in the appliance-input
voltage.
• Install proper grounding for the site to avoid damage from lightning and power surges.
• The chassis does not have a user-selectable operating range. Refer to the label on the chassis for the
correct appliance input-power requirement.
• Several styles of AC-input power supply cords are available for the chassis; make sure that you have the
correct style for your site.
• If you are using dual redundant (1+1) power supplies, we recommend that you use independent electrical
circuits for each power supply.
• Install an uninterruptible power source for your site, if possible.
Rack Configuration Considerations
See Rack-Mount the Chassis Using Slide Rails, on page 54 for the procedure for rack-mounting the chassis.
Consider the following when planning a rack configuration:
• Standard 19-inch (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.
• The rack-mounting posts need to be 2 to 3.5 mm thick to work with the slide rail rack mounting.
• 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.
Cisco Secure Firewall 3100 Series Hardware Installation Guide
49
Installation Preparation
Power Supply Considerations
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