Table 39. Gas and particulate exposure (continued)
Contaminate Requirement
Particulate contamination Data centers must meet the cleanliness level of ISO
14644-1 class 8. For data centers without airside
economizer, the ISO 14644-1 class 8 cleanliness might be
met simply by the choice of the following filtration:
v The room air might be continuously filtered with
MERV 8 filters.
v Air entering a data center might be filtered with
MERV 11 or preferably MERV 13 filters.
For data centers with airside economizers, the choice of
filters to achieve ISO class 8 cleanliness depends on the
specific conditions present at that data center.
The deliquescent relative humidity of the particulate
contamination should be more than 60% RH.3
4
.
Data centers must be free of zinc whiskers
5
.
Notes:
1. ANSI/ISA-S71.04. 1985. Environmental conditions for process measurement and control systems: Airborne contaminants,
Instrument Society of America, Research Triangle Park, NC, 1985.
2. The derivation of the equivalence between the rate of copper corrosion product thickness growth in Å/month
and the rate of weight gain assumes that Cu
2
S and Cu
2
O grow in equal proportions.
3. The derivation of the equivalence between the rate of silver corrosion product thickness growth in Å/month and
the rate of weight gain assumes that Ag
2
S is the only corrosion product.
4. 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.
5. Surface debris is randomly collected from 10 areas of the data center on a 1.5 cm diameter disk of sticky
electrically conductive tape on a metal stub. If examination of the sticky tape in a scanning electron microscope
reveals no zinc whiskers, the data center is considered free of zinc whiskers.
Acoustical specifications
This section introduces acoustical specifications for the TS3500 Tape Library.
For the purposes of acoustical specifications, when the TS3500 Tape Library is both
operating and idling the following conditions apply:
v Power is on.
v All air-moving devices are operating.
v Tape cartridges are loaded in all drives.
When the library is operating, the cartridge accessor loads, unloads, or moves tape
cartridges; when the library is idling, the accessor does not move.
The TS3500 Tape Library is a Category 1 product as defined in C-S 1-1710-006.
116 IBM System Storage TS3500 Tape Library with ALMS: Introduction and Planning Guide
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