Dell PowerEdge EL Owner's Manual page 146

Environmental
Particulate Contamination
NOTE: This section defines the limits to help avoid IT equipment damage and/or failure from particulates and
gaseous contamination. If it is determined that levels of particulates or gaseous pollution are beyond the limits
specified below and are the reason for the damage and/or failures to your equipment, it may be necessary for you
to re-mediate the environmental conditions that are causing the damage and/or failures. Re-mediation of
environmental conditions will be the responsibility of the customer.
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.
Conductive Dust
NOTE: Applies to data center and non-data center
environments.
Corrosive Dust
NOTE: Applies to data center and non-data center
environments.
Gaseous Contamination
NOTE: Maximum corrosive contaminant levels measured at ≤50% relative humidity.
Copper Coupon Corrosion Rate
Silver Coupon Corrosion Rate
146
Data center air filtration as defined by ISO Class 8 per
ISO 14644-1 with a 95% upper confidence limit.
NOTE: Air entering the data center must have
MERV11 or MERV13 filtration.
Air must be free of conductive dust, zinc whiskers, or
other conductive particles.
• Air must be free of corrosive dust.
• Residual dust present in the air must have a
deliquescent point less than 60% relative
humidity.
<300 Å/month per Class G1 as defined by ANSI/
ISA71.04-1985.
<200 Å/month as defined by AHSRAE TC9.9.