H3c-technologies H3C WX5500E Series Access Controllers Manuel d'utilisateur télécharger pdf (Page 9)

Table 2 Dust concentration limit in the equipment room

Substance Concentration limit (

articles/m

)

Dust particles

≤ 3 x 10

(No visible dust on desk in three days)

NOTE:

Dust particle diameter ≥ 5 μm

To eliminate corrosion and premature aging of components, the equipment room must also meet limits on

salts, acids, and sulfides, 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

Cooling

The device uses left to right airflow for heat dissipation. Plan the installation site for adequate ventilation.

• H3C recommends that you leave a minimum of 10 cm (3.94 in) of clearance around the air vents.

• Make sure the rack is well ventilated.

Figure 1 Airflow through the device chassis

ESD prevention

To prevent electrostatic discharge (ESD), follow these guidelines:

• Ground the device properly.

• Take dust-proof measures for the equipment room. For more information, see "Cleanness."

• Maintain the humidity and temperature at a proper level. For more information, see "Temperature

and h

umidity."

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H3c-technologies H3C WX5500E Series Access Controllers Manuel d'utilisateur Page 9