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Free ASHRAE HFDP Exam Questions and Answer
NEW QUESTION # 54
When used in a medical facility, which of the following types of filters reduces airborne volatile compounds?
- A. Charcoal
- B. Rigid
- C. Cartridge
- D. Bag
Answer: A
Explanation:
Comprehensive and Detailed Explanation:
Filter Function: Activated charcoal (carbon) filters adsorb volatile organic compounds (VOCs) and odors, per ASHRAE Handbook-Fundamentals. Cartridge, bag, and rigid filters target particulates, not VOCs.
NEW QUESTION # 55
Which of the following is the recommended location for Group E (non-aspirating) air diffusers in Operating Rooms?
- A. High on the sidewall on at least two opposite walls
- B. In the center of the ceiling over the surgical table
- C. In the substerile ceiling
- D. On the perimeter of the room outside of the lights
Answer: B
Explanation:
Comprehensive and Detailed Explanation:
Group E Diffusers: These non-aspirating diffusers provide laminar, downward airflow. ASHRAE Standard
170 and FGI Guidelines recommend placement in the ceiling center, directly above the surgical table, to ensure clean air blankets the sterile field.
Option Analysis:
A: Correct-center ceiling placement is standard for ORs.
B/C: Sidewall or perimeter placement disrupts laminar flow.
D: Substerile areas are adjacent, not the OR itself.
NEW QUESTION # 56
An Airborne Infection Isolation Room is 10 ft. × 12 ft. (3.05 m × 3.66 m) and has an 8 ft. (2.44 m) ceiling. An adjoining anteroom measures 6 ft. × 8 ft. (1.83 m × 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. 15.6 ACH
- B. 14.3 ACH
- C. 12.5 ACH
- D. 13.6 ACH
Answer: C
Explanation:
Comprehensive and Detailed Explanation:
Room Volume: 10 × 12 × 8 = 960 ft³.
ACH Calculation: ACH = (Airflow in CFM × 60) / Room Volume. For AIIRs, ASHRAE 170 uses exhaust airflow (200 CFM) since it determines air changes: ACH = (200 × 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 # 57
An Airborne Infection Isolation Room (AIIR) is located in a nursing unit on the second floor of a three-story hospital. Which of the following locations is BEST for an exhaust fan for the AIIR?
- A. In the Level 2 Machine Room
- B. Above the ceiling of the AIIR
- C. Above the anteroom of the AIIR
- D. On the roof
Answer: D
NEW QUESTION # 58
Which of the following ASHRAE Standards establishes the mechanical equipment energy efficiency requirements for facilities?
- A. Standard 90.1
- B. Standard 62.1
- C. Standard 188
- D. Standard 170
Answer: A
NEW QUESTION # 59
What determines building envelope requirements in ASHRAE Standard 90.1?
- A. Building orientation
- B. Building area
- C. Project construction budget
- D. Climate zone
Answer: D
NEW QUESTION # 60
Energy recovery systems serving Airborne Infectious Isolation Rooms must meet which of the following criteria?
- A. Total effectiveness greater than 50%
- B. Supply airstream and exhaust airstream components are separated by an air gap open to the atmosphere
- C. Leakage potential shall be designed to have no more than 5% of the total supply airstream consisting of exhaust air
- D. Wheel leakage of less than 0.5%, as determined by an SF6 test performed on the fully operational system in the field
Answer: C
NEW QUESTION # 61
In addition to nutrients and a favorable temperature, which of the following do disease organisms require for optimal growth?
- A. Light
- B. Moisture
- C. Host body
- D. Air
Answer: B
NEW QUESTION # 62
Airflow in Protective Environment Rooms is designed:
- A. To flow from the patient care area to the corridor
- B. With filters at 95% ASHRAE dust spot
- C. With filters at MERV 13
- D. To flow from the adjacent areas to the patient care area
Answer: A
NEW QUESTION # 63
Which of the following air-to-air heat recovery strategies will result in the greatest possibility of cross- contamination between air streams?
- A. Runaround Coil System
- B. Plate Heat Exchangers
- C. Heat Pipe Systems
- D. Heat Wheels
Answer: D
NEW QUESTION # 64
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 an Airborne Infection Isolation Room with the door to the corridor propped open
- C. This is a Protective Environment Room with inadequate toilet room exhaust of 25 cfm (12 L/s)
- D. This is an Airborne Infection Isolation Room with inadequate toilet room exhaust of 25 cfm (12 L/s)
Answer: D
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 # 65
Airborne Infection Isolation Rooms are designed to:
- A. Protect staff and visitors from infection
- B. Be switched from neutral to positive
- C. Protect patients from infection
- D. Be switched from neutral to negative
Answer: A
NEW QUESTION # 66
Which of the following represents the MINIMUM distance that must separate a fresh air intake and an exhaust system outlet?
- A. 25 ft. (7.62 m)
- B. 15 ft. (4.57 m)
- C. 30 ft. (9.14 m)
- D. 20 ft. (6.10 m)
Answer: A
Explanation:
Comprehensive and Detailed Explanation:
Separation Requirement: ASHRAE Standard 170, Section 6.3.2, and ASHRAE 62.1 specify a minimum 25 ft separation between fresh air intakes and exhaust outlets to prevent re-entrainment of contaminants.
NEW QUESTION # 67 
A healthcare facility is renovating a cart washing station within the Central Sterile Reprocessing (CSR) Department. Based on the diagram above, which of the following describes the proper direction of airflow between the CSR and the renovation area?
Options:
- A. neutral
- B. in
- C. dynamic
- D. out
Answer: D
Explanation:
The CSR (Central Sterile Reprocessing) area must be maintained at a higher pressure than adjacent spaces to prevent contaminants from entering. The airflow should be directed outward from CSR to the renovation area to protect the sterile environment.
NEW QUESTION # 68
In a humidifier control sequence, humidifiers are modulated to maintain which of the following?
- A. Saturated exhaust air
- B. Exhaust air relative humidity
- C. Saturated supply air
- D. Supply air relative humidity
Answer: D
NEW QUESTION # 69
Mechanical ventilation of indoor medical gas storage areas is required when the minimum gas volume is greater than?
- A. 3,000 cubic ft (84.95 cubic m)
- B. 600 cubic ft (16.99 cubic m)
- C. 6,000 cubic ft (169.90 cubic m)
- D. 300 cubic ft (8.50 cubic m)
Answer: A
NEW QUESTION # 70
According to the most current edition of ASHRAE Standard 170, which of the following is the correct number of air changes per hour for a treatment room?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION # 71
Which of the following is associated with "hot rooms"?
- A. Nuclear Medicine
- B. Central Plant
- C. Newborn ICU
- D. Physical Therapy
Answer: A
Explanation:
Comprehensive and Detailed Explanation:
Hot Rooms: In healthcare, "hot rooms" refer to areas in Nuclear Medicine where radioactive materials (e.g., for imaging) are handled, requiring special HVAC considerations (ASHRAE Handbook-HVAC Applications).
NEW QUESTION # 72
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