Some software might differ from its retail version (if available) and might not include
user manuals or all program functionality.
Particulate contamination
Attention:
Airborne particulates (including metal flakes or particles) and reactive
gases acting alone or in combination with other environmental factors such as
humidity or temperature might pose a risk to the storage expansion enclosure that
is described in this document. Risks that are posed by the presence of excessive
particulate levels or concentrations of harmful gases include damage that might
cause the storage expansion enclosure to malfunction or cease functioning
altogether. This specification sets forth limits for particulates and gases that are
intended to avoid such damage. The limits must not be viewed or used as definitive
limits, because numerous other factors, such as temperature or moisture content of
the air, can influence the impact of particulates or environmental corrosives and
gaseous contaminant transfer. In the absence of specific limits that are set forth in
this document, you must implement practices that maintain particulate and gas
levels that are consistent with the protection of human health and safety. If IBM
determines that the levels of particulates or gases in your environment have caused
damage to the storage expansion enclosure, IBM may condition provision of repair
or replacement of storage expansion enclosure or parts on implementation of
appropriate remedial measures to mitigate such environmental contamination.
Implementation of such remedial measures is a customer responsibility.
Table 68. 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.
Documentation format
The publications for this product are in Adobe Portable Document Format (PDF)
and should be compliant with accessibility standards. If you experience difficulties
when you use the PDF files and want to request a Web-based format or accessible
PDF document for a publication, direct your mail to the following address:
Information Development
IBM Corporation
Notices
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Summary of Contents for DS4700 EXPRESS
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