Supermicro SuperServer SYS-621H-TN12R User Manual page 142

General Data Center Environmental Specifications
Particulate contamination specifications
Air filtration: Data centers must be kept clean to Class 8 of ISO 14644-1 (ISO 2015). The air entering the data center
should be filtered with a MERV 11 filter or better. The air within the data center should be continuously filtered with a
MERV 8 filter or better.
Conductive dust: Air should be free fo conductive dust, zinc whiskers, or other conductive particles.
Corrrosive dust: Air should be free of corrosive dust.
Gaseous* contamination specifications
Copper coupon corrosion rate: <300 Å/month per class G1 as defined by ANSI.ISA71.04-2013, reference by ASHRAE TC
9.9
Silver coupon corrosion rate: <200 Å/month per class G1 as defined by ANSI.ISA71.04-2013, reference by ASHRAE TC 9.9
*If testing with silver or copper coupons results in values less that 200 Å/month or 300 Å/month, respectively, then operating
up to 70% relative humidity (RH) is acceptable. If the testing shows corrosion levels exceed these limits, then catalyst-
type pollutants are probably present and RH should be driven to 50% or lower.
Appendix B: System Specifications
142