Huawei R240D Hardware Installation page 76

R240D
Hardware Installation and Maintenance Guide
Table 5-11 Requirements for dust particles in the equipment room
Mechanical active
material
Dust particle
Suspending dust
Precipitable dust
Description



Take the following measures to meet the requirements:




Requirements for Corrosive Gases
The room should be free from dusts and corrosive gases, such as SO
5-12 lists the requirements for the corrosive gas concentration.
Table 5-12 Requirements for corrosive gas concentration
Chemical active
material
SO
H
2
NH
Cl
Take the following measures to meet the requirements:


Issue 03 (2016-01-26)
Dust particle diameter ≥ 5 µm
Suspending dust diameter ≤ 75 µm
75 µm ≤ precipitable dust diameter ≤ 150 µm
Use dustproof materials for ground, wall, and ceiling construction.
Use screens on the door and windows facing outside. The outer windows should be
dust-proof.
Clean the equipment room regularly and clean the air filter monthly.
Wear shoe covers and ESD clothing before entering the equipment room.
Unit
mg/m
2
S mg/m
mg/m
3
mg/m
2
Avoid constructing the room near a place where the corrosive gas concentration is high,
such as a chemical plant.
Ensure the air intake vent of the room is in the prevailing upwind direction from any
pollution source.
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Unit
3
Particle /m
3
mg/m
2
mg/m · h
Concentration
3
≤0.20
3
≤0.006
3 ≤0.05
3 ≤0.01
5 Appendix
Concentration
4
≤ 3x 10
(no visible dust accumulated
on a workbench in three
days)
≤0.2
≤1.5
, H S, and NH . Table
2 2 3
70