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Table 28. Limits for particulates and gases
Contaminant Limits
Particulate
• The room air must be continuously ltered with 40% atmospheric dust spot efciency
(MERV 9) according to ASHRAE Standard 52.2
1
.
• Air that enters a data center must be ltered to 99.97% efciency or greater, using
high-efciency particulate air (HEPA) lters that meet MIL-STD-282.
• The deliquescent relative humidity of the particulate contamination must be more than 60%
2
.
• The room must be free of conductive contamination such as zinc whiskers.
Gaseous • Copper: Class G1 as per ANSI/ISA 71.04-1985
3
• 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 Efciency 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.
Restriction of Hazardous Substances Directive (RoHS)
This topic provides statements about the Restriction of Hazardous Substances Directive (RoHS).
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