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.