Dell PowerEdge T130 Owner's Manual page 116

Particulate Specifications
contamination
Conductive dust Air must be free of conductive dust, zinc whiskers, or other conductive particles.
Corrosive dust
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Gaseous Specifications
contamination
Copper coupon <300 Å/month per Class G1 as defined by ANSI/ISA71.04-1985.
corrosion rate
Silver coupon <200 Å/month as defined by AHSRAE TC9.9.
corrosion rate
NOTE: Maximum corrosive contaminant levels measured at ≤50% relative humidity.
116
NOTE: Air entering the data center must have MERV11 or MERV13 filtration.
NOTE: 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: Applies to data center and non-data center environments.