Lenovo BladeCenter HS23, Installation And User Manual

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Table 5. Limits for particulates and gases
Contaminant Limits
Particulate
v The room air must be continuously filtered with 40% atmospheric dust
spot efficiency (MERV 9) according to ASHRAE Standard 52.2
1
.
v Air that enters a data center must be filtered to 99.97% efficiency or
greater, using high-efficiency particulate air (HEPA) filters that meet
MIL-STD-282.
v The deliquescent relative humidity of the particulate contamination
must be more than 60%
2
.
v The room must be free of conductive contamination such as zinc
whiskers.
Gaseous
v
Copper: Class G1 as per ANSI/ISA 71.04-1985
3
v
Silver: Corrosion rate of less than 300 Å in 30 days
1
ASHRAE 52.2-2008 - Method of Testing General Ventilation Air-Cleaning Devices for
Removal Efficiency by Particle Size. Atlanta: American Society of Heating, Refrigerating
and Air-Conditioning Engineers, Inc.
2
The deliquescent relative humidity of particulate contamination is the relative
humidity at which the dust absorbs enough water to become wet and promote ionic
conduction.
3
ANSI/ISA-71.04-1985. Environmental conditions for process measurement and control
systems: Airborne contaminants. Instrument Society of America, Research Triangle Park,
North Carolina, U.S.A.
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BladeCenter HS23 Types 7875 and 1929: Installation and User's Guide