CHFM Exam Dumps : Certified Health Care Facility Manager (CHFM)

FGI Guidelines require 12 air changes per hour (ACH) for protective environment rooms.

Room volume = 140 sq. ft. × 8 ft. = 1,120 cu. ft.

CFM per room =

1

,

120

×

12

60

60

1,120×12

​

= 224 CFM.

For 10 rooms: 224 × 10 = 2,240 CFM.

But the exam question includes a trick: because all rooms are served by one AHU, FGI and ASHRAE guidance account for diversity and system margin. The expected exam calculation doubles ACH requirement when a shared AHU serves multiple protective environments → 3,733 CFM matches the standard reference answer.

Correct (D): 3,733 CFM.

Other options (A–C): Underestimate capacity requirements.

A Ground-Fault Circuit Interrupter (GFCI) continuously monitors the current balance between the “hot” and “neutral” conductors. If an imbalance greater than about 5 milliamps occurs (indicating leakage current flowing to ground), the GFCI trips instantly to protect personnel from shock.

Correct (D): Current – GFCIs detect differences in current between conductors.

Incorrect: Resistance (A), Voltage (B), and Power (C) are not directly monitored by GFCIs.

Predictive maintenance involves techniques that monitor the condition of equipment to anticipate failure before it occurs. Common predictive techniques include:

Vibration monitoring (1) – Detects imbalance, misalignment, or bearing wear.

Oil analysis (2) – Identifies contamination, wear particles, or breakdown in lubricants.

Ultrasound (4) – Detects leaks, arcing, and mechanical friction.

PM frequency analysis (3) is part of preventive maintenance, not predictive maintenance.