H3c-technologies H3C SecPath F5000-A5 Firewall User Manual download pdf (Page 13)

Temperature and humidity

Maintain appropriate temperature and humidity in the equipment room.

• Lasting high relative humidity can cause poor insulation, electricity creepage, mechanical property

change of materials, and metal corrosion.

• Lasting low relative humidity can cause washer contraction and ESD and bring problems including

loose captive screws and circuit failure.

• High temperature can accelerate the aging of insulation materials and significantly lower the

reliability and lifespan of the firewall.

Table 1 Temperature and humidity requirements

Ambient tem

erature Ambient relative humidit

• Operating

0°C to 45°C (32°F to 113°F)

• Nonoperating and storage

–40°C to +70°C (–40°F to +158°F)

• Operating

10% to 95%, noncondensing

• Nonoperating and storage

5% to 95%, noncondensing

Cleanness

Dust buildup on the chassis may result in electrostatic adsorption, which causes poor contact of metal

components and contact points, especially when indoor relative humidity is low. In the worst case,

electrostatic adsorption can cause communication failure.

Table 2 Dust concentration limit in the equipment room

Substance Concentration limit (

articles/cu m)

Dust particles

 3 x 10

(No visible dust on desk in three days)

NOTE:

Dust particle diameter  5 m

The equipment room must also meet strict limits on salts, acids, and sulfides to eliminate corrosion and

premature aging of components, as shown in Table 3.

Table 3 Harmful gas li

mits in an equipment room

Gas Max. (m

)

0.2

S 0.006

0.05

0.01

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 120 121

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H3c-technologies H3C SecPath F5000-A5 Firewall User Manual Page 13