[Q36-Q51] Latest ASHRAE HFDP First Attempt, Exam real Dumps Updated [Apr-2026]

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Latest ASHRAE HFDP First Attempt, Exam real Dumps Updated [Apr-2026]

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Q36. Which of the following ventilation system criteria is the MINIMUM for a room housing a patient who has a compromised immune system?

12 ACH, airflow direction away from patient

12 ACH, airflow direction towards the patient

15 ACH, airflow direction away from patient

15 ACH, airflow direction towards the patient

Comprehensive and Detailed Explanation:
Protective Environment (PE) Room: Designed for immunocompromised patients (e.g., transplant recipients), ASHRAE Standard 170, Section 7.2.2, requires 12 ACH minimum and positive pressure (airflow towards the patient) to protect against external contaminants.
Option Analysis:
A/C: Airflow away from the patient (negative pressure) is for AIIRs, not PE rooms.
B: Correct-12 ACH with positive pressure meets the minimum for a PE room.
D: 15 ACH exceeds the minimum requirement.

Q37. In a conditioned space, when the total grains of moisture in the air remain constant and the dry bulb temperature of the air drops, which of the following psychrometric reactions will occur?

The relative humidity will fall

The humidity ratio will fall

The humidity ratio will rise

The relative humidity will rise

Comprehensive and Detailed Explanation:
Psychrometrics: Humidity ratio (grains/lb) remains constant if moisture isn’t added/removed. As dry bulb temperature drops, air’s capacity to hold moisture decreases, increasing relative humidity (RH).
Option Analysis:
A: Incorrect-RH rises, not falls.
B/C: Incorrect-Humidity ratio stays constant.
D: Correct-RH rises with lower temperature.

Q38. In accordance with the ASHRAE HVAC Design Manual for Hospitals and Clinics, to avoid carryover of droplets from a standard cooling coil into the air handling unit casing, the recommended MAXIMUM air velocity through the cooling coil should be no more than:

450 fpm (2.29 m/s)

550 fpm (2.79 m/s)

650 fpm (3.30 m/s)

750 fpm (3.81 m/s)

Q39. Which of the following is a key consideration of the Infection Control Risk Assessment Mitigation process when applied to a hospital renovation project?

Determining the location of Isolation Rooms

Protection from construction debris

Identification of the type of finishes required

Establishing the contractor qualifications

Q40. Environmental conditions, systems, and physical plant equipment are BEST monitored by a:

Building operations staff member

Building automation system

Fire alarm system

Facility rounds checklist program

Q41. Which of the following is the MOST important factor when evaluating how effective a Variable Air Volume system will be in saving energy in an area or room?

Number of procedures performed

Size of the area or room

Type of procedure being performed

Amount of time that the airflow can be reduced

Q42. A central cooling system is designed so that the number and arrangement of cooling sources is sufficient to support the facility operation plan in case of a breakdown of any one of the cooling sources. According to ASHRAE Standard 170, this applies when the cooling load exceeds a MINIMUM of:

4 tons (14 kW)

40 tons (140 kW)

400 tons (1,400 kW)

4000 tons (14,000 kW)

Q43. Which of the following air-to-air heat recovery strategies will result in the greatest possibility of cross- contamination between air streams?

Plate Heat Exchangers

Heat Pipe Systems

Runaround Coil System

Heat Wheels

Q44. According to the most current FGI Guidelines, HVAC modifications that affect more than 10% of the system capacity shall?

Require a DDC control system upgrade

Require an upgrade to premium efficiency motors

Require a retrofit to include an economizer/heat recovery

Require a pre-renovation water/air flow rate measurement

Q45. A single level of a medical center provides for inpatient care and measures 202 ft. (61.57 m) by 220 ft. (67.06 m). Which of the following represents the MINIMUM number of smoke compartments that this space must be divided into?

Q46. An airborne infection isolation (AII) patient room has a volume of 1,100 cubic feet (31.15 m³) and requires a minimum supply airflow of 12 air changes per hour (ACH). Airflow across the door to maintain pressurization is 150 CFM (70.8 L/s). Leakage and toilet room exhaust is 130 CFM (61.4 L/s). What airflow should the exhaust fan serving the patient room and toilet room be sized for?

70 CFM (33.0 L/s)

150 CFM (70.8 L/s)

370 CFM (174.6 L/s)

500 CFM (236.0 L/s)

Comprehensive and Detailed Explanation:
Supply Air: 12 ACH × 1,100 ft³ / 60 = 220 CFM.
Exhaust Requirement: Exhaust = Supply + Leakage + Door Airflow = 220 + 130 + 150 = 500 CFM.
However, toilet exhaust (130 CFM) is included, so room exhaust = 500 – 130 = 370 CFM.

Q47. 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?

24 in. (61 cm)

30 in. (76 cm)

31 in.(91 cm)

42 in. (107 cm)

Q48. Which of the following devices controls the quantity of outdoor air that enters a building?

VAV box dampers

Balancing dampers

Mixed air dampers

Smoke dampers

Q49. Which of the following is the BEST location of a return grille in a Protective Environment Room?

In the toilet room on the ceiling

In the floor under the window

In the anteroom on the ceiling

Low on the sidewall by the room entrance

Comprehensive and Detailed Explanation:
PE Room Design: ASHRAE Standard 170, Section 7.2.2, requires positive pressure with supply air from ceiling diffusers (HEPA-filtered) and return/exhaust low on the sidewall to maintain airflow from clean to less clean areas (e.g., towards the entrance).
Option Analysis:
A: Toilet exhaust is separate, not the primary return.
B: Floor placement is less common and less effective.
C: Anteroom return doesn’t control room airflow.
D: Correct-low sidewall near entrance optimizes airflow.

Q50. Which of the following is a key role of the HVAC system designer during the Infection Control Risk Assessment process?

Serve as a resource to the multidisciplinary team

Prepare test and balance reports

Supply air quality data to assess filtration needs

Locate the mechanical spaces within the building

Q51. 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?