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ASHRAE Healthcare Facility Design Professionals Sample Questions (Q38-Q43):
NEW QUESTION # 38
An Airborne Infection Isolation Room is 10 ft. ร 12 ft. (3.05 m ร 3.66 m) and has an 8 ft. (2.44 m) ceiling. An adjoining anteroom measures 6 ft. ร 8 ft. (1.83 m ร 2.44 m) with a 7.5 ft. (2.29 m) ceiling height. Airflow measurements reveal: Room supply diffuser: 135 CFM (64 L/s), Exhaust register: 200 CFM (95 L/s), Anteroom supply diffuser: 100 CFM (48 L/s), Anteroom exhaust register: 65 CFM (31 L/s). Which of the following represents the correct patient room air change rate (ACH)?
- A. 14.3 ACH
- B. 13.6 ACH
- C. 12.5 ACH
- D. 15.6 ACH
Answer: C
Explanation:
Comprehensive and Detailed Explanation:
Room Volume: 10 ร 12 ร 8 = 960 ftยณ.
ACH Calculation: ACH = (Airflow in CFM ร 60) / Room Volume. For AIIRs, ASHRAE 170 uses exhaust airflow (200 CFM) since it determines air changes: ACH = (200 ร 60) / 960 = 12,000 / 960 = 12.5 ACH.
Verification: Supply (135 CFM) < Exhaust (200 CFM) ensures negative pressure, consistent with AIIR requirements (12 ACH minimum, Table 7.1).
NEW QUESTION # 39
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?
- A. This is a Protective Environment Room with the door to the corridor propped open
- B. This is a Protective Environment Room with inadequate toilet room exhaust of 25 cfm (12 L/s)
- C. This is an Airborne Infection Isolation Room with inadequate toilet room exhaust of 25 cfm (12 L/s)
- D. This is an Airborne Infection Isolation Room with the door to the corridor propped open
Answer: C
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 # 40
A patient room was designed to provide 3 ACH of 100% outside air. The room is to be converted to an Airborne Infection Isolation Room (AIIR). A dedicated exhaust will be installed for the room, but there will be no changes to the supply. Which of the following additional changes will be required in order to meet the ventilation recommendations of ASHRAE Standard 170?
- A. Provide a supplemental recirculating device with HEPA filter
- B. Provide a parallel anteroom
- C. Provide personal protective respirators
- D. Provide Ultra Violet Germicidal Irradiation
Answer: A
Explanation:
Comprehensive and Detailed Explanation:
AIIR Requirement: ASHRAE 170, Table 7.1, requires 12 ACH for AIIRs. With only 3 ACH supply, a supplemental HEPA-filtered recirculation unit can increase effective ACH to meet the standard while maintaining negative pressure via the new exhaust.
Option Analysis:
A: Anteroom is optional, not required.
B: UVGI is supplementary, not an ACH solution.
C: Respirators are PPE, not HVAC.
D: Correct-meets ACH requirement.
NEW QUESTION # 41
Under condition 1 of the NFPA 70, what is the MINIMUM clearance required in front of exposed live parts with nominal voltage to ground of 600V?
- A. 31 in.(91 cm)
- B. 30 in. (76 cm)
- C. 24 in. (61 cm)
- D. 42 in. (107 cm)
Answer: A
NEW QUESTION # 42
Which of the following control methods offers the MOST building information versatility in controls and building management?
- A. Direct digital control
- B. Electric control systems
- C. Electronic control systems
- D. Pneumatic controls
Answer: A
NEW QUESTION # 43
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