Dell DL4000 Owner's Manual page 84

Environmental
NOTE: Applies to data center and non-data
center environments.
Gaseous Contamination
NOTE: Maximum corrosive contaminant levels measured at ≤50% relative humidity.
Copper Coupon Corrosion Rate
Silver Coupon Corrosion Rate
84
• Residual dust present in the air must have a
deliquescent point less than 60% relative
humidity.
<300 Å/month per Class G1 as defined by ANSI/
ISA71.04-1985.
<200 Å/month as defined by AHSRAE TC9.9.