20Particulatecontamination SpecificationsNOTE: This condition applies only to data centerenvironments. Air filtration requirements do notapplytoIT 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 MERV11or MERV13filtration.Conductive dust Air must be free of conductive dust, zinc whiskers, or otherconductive particles.NOTE: This condition applies to data center and nondatacenter environments.Corrosive dust • Air must be free of corrosive dust.• Residualdustpresentintheair musthaveadeliquescentpoint less than 60% relativehumidity.NOTE: This condition applies to data center and nondatacenter environments.Table 17. Gaseous contamination specificationsGaseous contamination SpecificationsCopper 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.NOTE: Maximum corrosive contaminant levels measured at ≤50% relative humidity.Expanded operating temperatureTable 18. Expanded operating temperature specificationsExpanded operating temperature SpecificationsContinuous operation 5°C to 40°C at 5% to 85% RH with 29°C dew point.NOTE:Outsidethestandardoperatingtemperature(10°C to 35°C), the system can operate continuously intemperatures as low as 5°C and as high as 45°C.For temperatures between 35°C and 40°C, derate maximumallowable temperature by 1°C per 175 m above 950 m (1°F per319 ft).< 1% of annual operating hours –5°C to 45°C at 5% to 90% RH with 29°C dew point.NOTE: Outside the standard operating temperature(10°C to 35°C), the system can operate down to –5°Corupto45°Cforamaximumof1%ofitsannualoperating hours.For temperatures between 40°C and 45°C, de-rate maximumallowable temperature by 1°C per 125 m above 950 m (1°F per228 ft).
