Table 70. Particulate contamination specifications
Particulate contamination Specifications
Air filtration
Data center air filtration as defined by ISO Class 8 per ISO 14644-1
with a 95% upper confidence limit.
NOTE: This condition applies to data center
environments only. Air filtration requirements do not
apply to IT equipment designed to be used outside a data
center, in environments such as an office or factory
floor.
NOTE: Air entering the data center must have MERV11
or MERV13 filtration.
NOTE: Air filtering can also be accomplished by filtering
room air with MERV8 filter per ANSI/ASHRAE Standard
127
Conductive dust Air must be free of conductive dust, zinc whiskers, or other
conductive particles.
NOTE: This condition applies to data center and non-
data center environments.
NOTE: Common sources of conductive dust include
manufacturing processes, and zinc whiskers from the
plating on the bottom of raised floor tiles
Corrosive dust • Air must be free of corrosive dust.
• Residual dust present in the air must have a deliquescent point
less than 60% relative humidity.
NOTE: This condition applies to data center and non-
data center environments.
Table 71. Gaseous contamination specifications
Gaseous contamination Specifications
Copper Coupon Corrosion rate <300 Å/month per Class G1 as defined by ANSI/ISA71.04-2013
Silver Coupon Corrosion rate <200 Å/month as defined by ANSI/ISA71.04-2013
NOTE: Maximum corrosive contaminant levels measured at ≤50% relative humidity.
Technical specifications 157
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