Operating temperature de-rating specificationsTable 17. Operating temperatureOperating temperature de-rating SpecificationsUp to 35°C (95°F) Maximum temperature is reduced by 1°C/300 m (1°F/547 ft)above 950 m (3,117 ft).35°C to 40°C (95°F to 104°F) Maximum temperature is reduced by 1°C/175 m (1°F/319 ft) above950 m (3,117 ft).40°C to 45°C (104°F to 113°F) Maximum temperature is reduced by 1°C/125 m (1°F/228Particulate and gaseous contamination specificationsTable 18. Particulate contamination specificationsParticulate contamination SpecificationsAir filtration Data center air filtration as defined by ISOClass 8 per ISO 14644-1 with a 95% upperconfidence limit.NOTE: This condition applies only to data center environments. Air filtration requirements do not apply to IT equipmentdesigned 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 Air must be free of conductive dust, zincwhiskers, or other conductive particles.NOTE: This condition applies to data center and non-data center environments.Corrosive dust 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 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.20 Technical specifications