Inspur NF5260FM6 User Manual page 63

Corrosive Gas
Group
Hydrogen
fluoride (HF)
Ammonia
Group B
(NH
Ozone (O
a: Parts per billion (ppb) is a unit of concentration, and 1 ppb represents 1 part
per billion.
The corrosive gases in Group A or Group B in Table 11-9 are common in data
centers. The copper and silver corrosion rates that correspond to the concentration
limits of corrosive gases in group A or group B must meet the severity level G1.
Gaseous corrosivity is not determined by a single factor, but by comprehensive
environmental factors such as temperature, relative humidity, and corrosive gases.
Any changes in environmental factors may affect the gaseous corrosivity level.
Therefore, the concentration limits of corrosive gases for data centers provided in
Table 11-9 are for reference only. If the concentration of mixed gases is not listed,
see the concentration range of the gases in the table for condition levels of
chemically reactive substances per IEC-60721-3-3 or GB/T 4798.3-2007.
4. Mechanically Reactive Substances
The server room must be free of explosive, conductive, magnetic, and corrosive
dust. Table 11-10 lists the requirements for mechanically reactive substances.
Table 11-10 Requirements for Mechanically Reactive Substances
Mechanically
Reactive Substances
Sand
Floating dust
Dust deposits
To meet the requirements, you must take the following measures for the server
room:
Make sure that no dust exists on the floors, walls, and ceiling surfaces.

Make sure that few or no windows are designed for the server room. Windows

in the server room must be dustproof.
Regularly clean the server room, the dust screens, or dust guards.

Make sure that visitors wear shoe covers and anti-static clothing before

entering the server room.
ppb
ppb
)
3
) ppb
3
Unit
mg/m
3
mg/m
3
mg/(m h)
2
Unit
< 1
< 500
< 2
≤ 30
≤ 0.2
≤ 1.5
55
Concentration
Requirement