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NEW QUESTION # 98
A new hospital project will have a central utility plant (CUP) that will utilize centrifugal chillers. The engineering team should reference which publication in the design process of the CUP area?
Answer: B
NEW QUESTION # 99
The isolation room is supplied with 300 cfm (142 L/s) of HEPA filtered air. The return air grille is located in the ceiling and has been balanced to 150 cfm (71 L/s). The room is monitored with a differential pressure sensor, and the sensor is sending an alarm signal to the nurse's station. Which of the following BEST describes the problem?
Answer: B
Explanation:
Comprehensive and Detailed Explanation:
Airflow Analysis: Supply = 300 cfm, Return = 150 cfm, Toilet Exhaust = 25 cfm. Total exhaust = 150 + 25 =
175 cfm. Net airflow = 300 - 175 = +125 cfm (positive pressure).
AIIR Requirements: ASHRAE Standard 170, Section 7.2.1, mandates negative pressure for Airborne Infection Isolation Rooms (AIIRs), meaning exhaust must exceed supply. Here, the room is positive (+125 cfm), triggering the pressure sensor alarm.
Problem Identification: The toilet exhaust (25 cfm) is insufficient to offset the supply, failing to achieve negative pressure. AIIRs typically require 50-75 cfm exhaust per toilet (Table 7.1), so 25 cfm is inadequate.
Option Analysis:
A: Correct-insufficient exhaust explains the positive pressure in an AIIR.
B: An open door would reduce pressure differential but not explain the airflow imbalance.
C/D: Protective Environment (PE) rooms require positive pressure, which aligns with the +125 cfm, but the alarm suggests an AIIR (negative pressure) context.
NEW QUESTION # 100
Which of the following equipment rooms would MOST appropriately be controlled to be positive to adjacent spaces?
Answer: B
NEW QUESTION # 101
Which of the following air-to-air heat recovery strategies will MOST likely have the highest heat transfer efficiency?
Answer: D
NEW QUESTION # 102
Smoke is detected at the supply duct smoke detector in a hospital without an engineered smoke control system. In accordance with the ASHRAE HVAC Design Manual for Hospitals and Clinics, the supply and return air smoke dampers should:
Answer: C
NEW QUESTION # 103
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