Dell PowerEdge R250 EMC Technical Specifications - Page 11

Table 18. Particulate contamination specifications Particulate contamination Air filtration Conductive dust Corrosive dust 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. 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. ● 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 19. Gaseous contamination specifications Gaseous contamination Copper Coupon Corrosion rate Silver Coupon Corrosion rate Specifications