Table 26 Particulate contamination specifications
Particulate contamination
Specifications
Air filtration
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 the MERV11 or MERV13
filtration.
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.
Corrosive dust
l
Air must be free of corrosive dust.
l
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 27 Gaseous contamination specifications
Gaseous contamination
Specifications
Copper 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.
Technical specifications
32
R740xd Owner's Guide
