Ruijie RG-AP820-I Installation And Reference Manual page 20

Hardware Installation and Reference Guide
affecting the service life of the device, but also causing communication faults. Table 2-1
describes the requirements for the dust content and granularity in the equipment room.
Table 2-1
Requirements for Dust
Dust
Dust particles (diameter ≤ 0.5 μm)
Dust particles (0.5 μm ≤ diameter ≤ 1
μm)
Dust particles (1 μm ≤ diameter ≤ 3
μm)
Dust particles (3 μm ≤ diameter ≤ 1
μm)
Apart from dust, the salt, acid, and sulfide in the air in the equipment room must meet strict
requirements. These harmful substances will accelerate metal corrosion and component
aging. Therefore, the equipment room should be properly protected against the intrusion of
harmful gases, such as sulfur dioxide, hydrogen sulfide, nitrogen dioxide, and chlorine gas.
Table 2-2 lists limit values for harmful gases.
Table 2-2
Requirements for Gases
Gas
Sulfur dioxide (SO
Hydrogen sulfide (HS)
Nitrogen dioxide (NO
Ammonia gas (NH
Chlorine gas (CI
Note
Average refers to the average value of harmful gases measured in one week. Maximum
refers to the upper limit of harmful gases measured in one week, and the maximum value lasts
up to 30 minutes every day.
Average (mg/m
) 0.2
2
0.006
) 0.04
2
) 0.05
3
) 0.01
2
Unit
3
Particles/m
3
Particles/m
3
Particles/m
3
Particles/m
3
)
12
Preparing for Installation
Content
≤1.4×10^7
≤7×10^5
≤2.4×10^5
≤1.3×10^5
3
Maximum (mg/m )
1.5
0.03
0.15
0.15
0.3