Dell PowerEdge XE2420 EMC Installation and Service Manual - Page 163

Particulate and gaseous contamination specifications The following table defines the limitations that help avoid any damages to the IT equipment and/or, or both failure from particulate and gaseous contamination. If the levels of particulate or gaseous pollution exceed the specified limitations and results in equipment damage or failure, you must rectify the environmental conditions. Remediation of environmental conditions is the responsibility of the customer. Table 70. Particulate contamination specifications Particulate contamination Air filtration Specifications 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/ASHARE 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. ● Any remaining dust present in the air shall 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 Copper Coupon Corrosion rate Silver Coupon Corrosion rate Specifications