Dust; Corrosive Gases; Table 4.4 Tolerable Limits For Corrosive Gases - Fujitsu M10 Series Installation Planning Manual

4.3.4

Dust

(1) Airborne dust
Ensure that airborne dust does not exceed 0.15 mg/m
systems are designed to withstand this level of airborne dust. This is the same as the
permissible level for airborne dust in a general office and should be easily attainable
in a computer room where there is little inflow of outside air and smoke.
(2) Removing dust
Airborne dust is collected by air filters in the air conditioner. For air filter, see
4.5.2, "Air conditioner filters."
remove dust on and under the floor. For cleaning procedures, see
free-access floor cleaning," in 2.3.2, "Free-access flooring."
Cleaning is required in the following situations:
 When the construction of the computer room has just been completed, and it is
ready to house equipment.
 When the computer room has been repaired.
 When equipment already in position in the computer room has been relocated.
Areas surrounding printers and for forms handling require periodic cleaning.
4.3.5

Corrosive gases

Corrosive gases must be removed and kept out by using appropriate air cleaning
facilities. Maintaining positive pressure in the computer room with filtered air will
serve as a safeguard against the entry of corrosive gases or dust from an outside
source.
Table 4.4
Gas name
Hydrogen sulfide (H
Sulfur dioxide (sulfur oxide) (SO
Hydrogen chloride (HCI)
Chlorine (CI
Hydrogen fluoride (HF)
C120-H007-08EN
lists the tolerable limits for different kinds of corrosive gases.

Table 4.4 Tolerable limits for corrosive gases (1/2)

S)
2
)
2
The computer room must be periodically cleaned to
Tolerable limit
Up to 7.1 ppb
) Up to 37 ppb
2
Up to 6.6 ppb
Up to 3.4 ppb
Up to 3.6 ppb
4.3 Air Conditioning Conditions
3
(0.004 mg/ft ). Most server
3
(6), "Base floor and
Section
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