Exin EXIN EPI Certified Data Centre Specialist CDCS Question # 12 Topic 2 Discussion
CDCS Exam Topic 2 Question 12 Discussion:
Question #: 12
Topic #: 2
You want to manage temperature and humidity only at the facility level in your data center. All servers use front-to-rear airflow. Which location for measurement should you recommend?
A.
At the back/rear of the server at 50 mm (2 in)
B.
At 1.5 m (5 ft) above the floor, 0.4 m (15 in) in front of the rack
C.
At the front/intake of the server at 50 mm (2 in)
D.
At 1.5 m (5 ft) above the floor, 0.4 m (15 in) at the back of the rack
ASHRAE recommends temperature and humidity be measured in the cold aisle, in front of racks, at approximately 1.5 m above the floor (average human working height) and 0.3–0.5 m from the rack face. This location captures the environmental conditions experienced at the IT equipment air intake, while still representing facility-level conditions (not single device-level).
Option A and C (at 50 mm intake/rear) are too close to individual servers and suited only for rack-level monitoring, not facility monitoring.
Option D (rear measurement) reflects exhaust air, not intake, and thus cannot be used to control environmental setpoints.
Maintaining measurement at standardized facility locations allows comparisons against ASHRAE’s recommended and allowable ranges (18–27 °C for Class A1 environments, 40–60% RH).
[References: ASHRAE TC 9.9 “Thermal Guidelines for Data Processing Environments” (2016), ANSI/TIA-942-B §6.5., , ]
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