AHA CHFM Exam With Confidence Using Practice Dumps

Overage = 140 cu. ft.

Each small cylinder = 25 cu. ft.

140 ÷ 25 = 5.6 → minimum 6 needed if rounding up. However, since the question asks for the minimum number to remove to get below the limit, removing 5 cylinders = 125 cu. ft. would still leave 15 cu. ft. over the limit. Therefore, 6 cylinders must be removed.

Correct answer = C (6), not B.

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.