The HVAC system should maintain the appropriate temperature and humidity levels, provide _____________ air-conditioning, and _________ pressurization and ventilation.
A.
Circulated, positive
B.
Closed-loop recirculating, positive
C.
Closed-loop recirculating, closed
D.
Circulated, closed
Explanation:
The HVAC system should maintain the appropriate temperature and
humidity levels, provide closed-loop recirculating air-conditioning, and positive
pressurization and ventilation.
Doesn’t positive pressure imply that the loop is open and not closed?
The answer should be closed-loop circulating, positive (not recirculated, which is bad):
“Recirculation occurs when hot air exhausted from rack-mounted computing devices is fed into device inlets. Recirculation can cause overheating damage to computing equipment and disruption to mission-critical services.
http://www.wrightline.com/images/WhitePapers/Scalable%20Design%20White%20Paper.pdf