Environmental
Air Filtration
NOTE: 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.
Data center air filtration as defined by ISO Class 8
per ISO 14644-1 with a 95 percent upper
confidence limit.
NOTE: Air entering the data center must
have MERV11 or MERV13 filtration.
Conductive Dust
NOTE: Applies to data center and non-data
center environments.
Air must be free from conductive dust, zinc
whiskers, or other conductive particles.
Corrosive Dust
NOTE: Applies to data center and non-data
center environments.
• Air must be free from corrosive dust.
• Residual dust present in the air must have a
deliquescent point less than 60 percent
relative humidity.
Gaseous Contamination
NOTE: Maximum corrosive contaminant levels measured at ≤50% relative humidity.
Copper Coupon Corrosion Rate <300 Å/month per Class G1 as defined by ANSI/
ISA71.04-1985.
Silver Coupon Corrosion Rate <200 Å/month as defined by AHSRAE TC9.9.
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