Table 11 Temperature and humidity
Condition System
Operating temperature range 64°— 75° F (18° to 24° C)
Operating relative humidity range 40 — 55%
Air quality requirements
VMAX All Flash arrays are designed to be consistent with the requirements of the
American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE)
Environmental Standard Handbook and the most current revision of Thermal
Guidelines for Data Processing Environments, ASHRAE TC 9.9 2011.
The arrays are best suited for Class 1A Datacom environments, which consist of tightly
controlled environmental parameters, including temperature, dew point, relative
humidity and air quality. These facilities house mission critical equipment and are
typically fault tolerant, including the air conditioners. In a data center environment, if
the air conditioning fails and the temperature is lost, a vault may occur to protect
data.
The data center should maintain a cleanliness level as identified in ISO 14664-1, class 8
for particulate dust and pollution control. 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 or better filtration system. In addition, efforts
should be maintained to prevent conductive particles, such as zinc whiskers, from
entering the facility.
The allowable relative humidity level is 20–80% non condensing, however, the
recommended operating environment range is 40–55%. For data centers with
gaseous contamination, such as high sulfur content, lower temperatures and humidity
are recommended to minimize the risk of hardware corrosion and degradation. In
general, the humidity fluctuations within the data center should be minimized. It is also
recommended that the data center be positively pressured and have air curtains on
entry ways to prevent outside air contaminants and humidity from entering the
facility.
For facilities below 40% relative humidity (RH), EMC recommends using grounding
straps when contacting the equipment to avoid the risk of electrostatic discharge
(ESD), which can harm electronic equipment.
As part of an ongoing monitoring process for the corrosiveness of the environment,
EMC recommends placing copper and silver coupons (per ISA 71.04-1985, Section 6.1
Reactivity) in airstreams representative of those in the data center. The monthly
reactivity rate of the coupons should be less than 300 Angstroms. When monitored
reactivity rate is exceeded, the coupon should be analyzed for material species and a
corrective mitigation process emplaced.
Specifications
Air quality requirements 29
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