7
Pre-installation checklist
Table 4 Checklist before installation
Item Requirements Result
Installation
site
Ventilation
• There is a minimum clearance of 100 mm (3.94 in)
around the inlet and outlet air vents for heat
dissipation of the firewall chassis.
• A good ventilation system is available at the
installation site.
Temperature
• Operating:
{ Without hard disks: 0°C to 45°C (32°F to 113°F)
{ With hard disks: 5°C to 40°C (41°F to 104°F)
• Storage: –40°C to +70°C (–40°F to +158°F)
Relative humidity
• Operating:
{ Without hard disks: 5% RH to 95% RH,
noncondensing
{ With hard disks: 10% RH to 90% RH,
noncondensing
• Storage: 5% RH to 95% RH, noncondensing
Cleanness
• Dust concentration ≤ 3 × 10
4
particles/m
3
• No dust on desk within three days
ESD prevention
• The equipment, workbench, and rack are reliably
grounded.
• The equipment room is dust-proof.
• The humidity and temperature are at an acceptable
level.
• Wear an ESD wrist strap and make sure it makes
good skin contact and is reliably grounded when
installing FRUs.
• Put the removed interface modules away on an ESD
workbench, with the PCB upward, or put them in ESD
bags for future use.
• Touch only the edges, instead of electronic
components when observing or moving a removed
interface module.
EMI prevention
• Take effective measures to protect the power system
from the power grid system.
• Separate the protection ground of the firewall from
the grounding device or lightning protection
grounding device as far as possible.
• Keep the firewall far away from radio stations, radar
and high-frequency devices working in high current.
• Use electromagnetic shielding when necessary.
Lightning
protection
• The grounding cable of the chassis is reliably
grounded.
• The grounding terminal of the AC power receptacle is
reliably grounded.
• (Optional.) A power lightning arrester is installed.
Electricity safety
• Equip a UPS.
• Locate the power switch in the equipment room. In
case of emergency during operation, switch off the
power switch.