Dell PowerEdge XR4000r Installation and Service Manual

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Particulate and gaseous contamination specifications

The following table defines the limitations that help avoid any equipment damage or failure from particulates and gaseous contamination. If the levels of particulates or gaseous pollution exceed the specified limitations and result in equipment damage or failure, you must rectify the environmental conditions. Remediation of environmental conditions is the responsibility of the customer.

Table 1. Particulate contamination specificationsAir filtration specification: Data center air filtration as defined by ISO Class 8 per ISO 14644-1 should have a 95% upper confidence limit. Note: This condition applies only to data center environments. 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. Conductive dust specification: 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. Corrosive dust specification: 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.
Particulate contamination Specifications
Air filtration: Conventional Data Center only Data center air filtration as defined by ISO Class 8 per ISO 14644-1 with a 95% upper confidence limit
NOTE: Filtering room air with a MERV8 filter, as specified in ANSI/ASHRAE Standard 127, is a recommended method for achieving the necessary environmental conditions.
NOTE:Air entering the data center must have MERV11 or MERV13 filtration.
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.
Walk-Up Edge Data Center or Cabinet (sealed, closed loop environment) Filtration is not required for cabinets that are anticipated to be opened six times or less per year. Class 8 per ISO 1466-1 filtration as defined above is required otherwise.
NOTE: In environments commonly above ISA-71 Class G1 or that may have known challenges, special filters may be required.
Conductive dust: data center and non-data center environments Air must be free of conductive dust, zinc whiskers, or other conductive particles.
NOTE: Conductive dust, which can interfere with equipment operation, can originate from various sources, including manufacturing processes and zinc whiskers that may develop on the plating of raised floor tiles.
NOTE:This condition applies to data center and non-data center environments.
Corrosive dust: data center and non-data center environments
  • 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 2. Gaseous contamination specificationsThe copper coupon corrosion rate is <300 Å/month per Class G1 as defined by ANSI/ISA71.04. The silver coupon corrosion rate is <200 Å/month as defined by ANSI/ISA71.04.
Gaseous contamination Specifications Notes
Copper coupon corrosion rate ISA-71 Class G1: <300 Å/month Per ANSI/ISA71.04
Silver coupon corrosion rate ISA-71 Class G1: <200 Å/month Per ANSI/ISA71.04

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