CERTIFIED MEDICAL GAS INSPECTOR EXAM
2026 with answers in bold✅ and
rationale graded A+
This is a comprehensive practice exam for the ASSE 6020 Medical Gas Systems Inspector
certification. It is based on NFPA 99 (Health Care Facilities Code, 2021/2024 editions).
Certified Medical Gas Inspector Practice Exam
1. Which NFPA standard is primarily used for the installation and inspection of Medical Gas and
Vacuum Systems?
A. NFPA 70
B. NFPA 101
C. NFPA 99
D. NFPA 13
Rationale: NFPA 99 establishes the criteria for levels of health care services based on risk to patients
and staff.
2. A Category 1 Medical Gas System is one in which failure of the equipment is likely to cause:
A. Major injury or death
B. Minor injury
C. Patient discomfort
D. No risk to patient safety
Rationale: NFPA 99 defines Category 1 as critical care where system failure is life-threatening.
3. Who is responsible for ensuring that the medical gas system is inspected by a certified 6020
inspector?
A. The plumber
B. The verifier
C. The Authority Having Jurisdiction (AHJ)
D. The hospital janitor
,CERTIFIED MEDICAL GAS INSPECTOR EXAM
2026 with answers in bold✅ and
rationale graded A+
Rationale: The AHJ ensures compliance with codes, though the facility owner typically hires the
inspector.
4. What is the minimum distance between the Medical Air intake and any exhaust from combustion
engines?
A. 10 feet
B. 25 feet
C. 50 feet
D. 5 feet
Rationale: To prevent carbon monoxide and other pollutants from entering the medical air supply.
5. Medical gas pipes must be labeled every ____ feet.
A. 10 feet
B. 20 feet
C. 5 feet
D. 50 feet
Rationale: NFPA 99 requires labeling at intervals not exceeding 20 feet and in every room/closet the
pipe passes through.
6. Which color is used to identify Medical Oxygen in the United States?
A. Green
B. White
C. Blue
D. Yellow
Rationale: Green is the US standard (CGA); White is the international (ISO) standard.
7. Nitrogen is primarily used in hospitals for:
A. Patient breathing
B. Anesthesia
,CERTIFIED MEDICAL GAS INSPECTOR EXAM
2026 with answers in bold✅ and
rationale graded A+
C. Powering pneumatic tools
D. Sterilization
Rationale: Nitrogen is a high-pressure support gas used for surgical tools.
8. The "Critical Pressure" for an alarm to trigger in a high-pressure line is when the pressure varies by
+/- ____% from the normal operating pressure.
A. 5%
B. 20%
C. 50%
D. 10%
Rationale: Pressure switches must trigger a local and master alarm if pressure fluctuates more than
20%.
9. What is the standard operating pressure for a Medical Vacuum system?
A. 50 psi
B. 100 psi
C. 12" to 30" HgV
D. 15" HgV
Rationale: Vacuum is measured in inches of Mercury (Hg); typical systems operate around 15-25"
HgV at the inlet.
10. Joints in medical gas copper tubing must be made using:
A. Soft solder
B. Glued fittings
C. Brazing with a BCuP series filler metal
D. Compression fittings
Rationale: Brazing provides a high-melting-point bond necessary for system integrity during fires.
(Note: For brevity, I will continue with key representative questions. In a real exam, these would
span all 100 slots.)
, CERTIFIED MEDICAL GAS INSPECTOR EXAM
2026 with answers in bold✅ and
rationale graded A+
11. During the brazing of medical gas pipes, what purge gas must be used?
A. Oil-free Dry Nitrogen
B. Oxygen
C. Carbon Dioxide
D. Argon
Rationale: Nitrogen displacement prevents the formation of copper oxide (scale) inside the pipe.
12. The Medical Air compressor must be located in a well-ventilated area and must be:
A. Liquid Ring only
B. Reciprocating only
C. Provided with at least two compressors (Duplex)
D. Oil-flooded without filters
Rationale: Redundancy is required for Category 1 systems to ensure continuous supply.
13. What is the color code for Medical Air?
A. Green
B. Yellow
C. Black
D. Blue
Rationale: Yellow is the standard color for Medical Air in the US.
14. Master alarm panels must be monitored ____:
A. Only during business hours
B. 24 hours a day
C. Once a week
D. Only when surgery is scheduled
Rationale: Master alarms must be at a 24-hour monitored location (e.g., security or engineering).
2026 with answers in bold✅ and
rationale graded A+
This is a comprehensive practice exam for the ASSE 6020 Medical Gas Systems Inspector
certification. It is based on NFPA 99 (Health Care Facilities Code, 2021/2024 editions).
Certified Medical Gas Inspector Practice Exam
1. Which NFPA standard is primarily used for the installation and inspection of Medical Gas and
Vacuum Systems?
A. NFPA 70
B. NFPA 101
C. NFPA 99
D. NFPA 13
Rationale: NFPA 99 establishes the criteria for levels of health care services based on risk to patients
and staff.
2. A Category 1 Medical Gas System is one in which failure of the equipment is likely to cause:
A. Major injury or death
B. Minor injury
C. Patient discomfort
D. No risk to patient safety
Rationale: NFPA 99 defines Category 1 as critical care where system failure is life-threatening.
3. Who is responsible for ensuring that the medical gas system is inspected by a certified 6020
inspector?
A. The plumber
B. The verifier
C. The Authority Having Jurisdiction (AHJ)
D. The hospital janitor
,CERTIFIED MEDICAL GAS INSPECTOR EXAM
2026 with answers in bold✅ and
rationale graded A+
Rationale: The AHJ ensures compliance with codes, though the facility owner typically hires the
inspector.
4. What is the minimum distance between the Medical Air intake and any exhaust from combustion
engines?
A. 10 feet
B. 25 feet
C. 50 feet
D. 5 feet
Rationale: To prevent carbon monoxide and other pollutants from entering the medical air supply.
5. Medical gas pipes must be labeled every ____ feet.
A. 10 feet
B. 20 feet
C. 5 feet
D. 50 feet
Rationale: NFPA 99 requires labeling at intervals not exceeding 20 feet and in every room/closet the
pipe passes through.
6. Which color is used to identify Medical Oxygen in the United States?
A. Green
B. White
C. Blue
D. Yellow
Rationale: Green is the US standard (CGA); White is the international (ISO) standard.
7. Nitrogen is primarily used in hospitals for:
A. Patient breathing
B. Anesthesia
,CERTIFIED MEDICAL GAS INSPECTOR EXAM
2026 with answers in bold✅ and
rationale graded A+
C. Powering pneumatic tools
D. Sterilization
Rationale: Nitrogen is a high-pressure support gas used for surgical tools.
8. The "Critical Pressure" for an alarm to trigger in a high-pressure line is when the pressure varies by
+/- ____% from the normal operating pressure.
A. 5%
B. 20%
C. 50%
D. 10%
Rationale: Pressure switches must trigger a local and master alarm if pressure fluctuates more than
20%.
9. What is the standard operating pressure for a Medical Vacuum system?
A. 50 psi
B. 100 psi
C. 12" to 30" HgV
D. 15" HgV
Rationale: Vacuum is measured in inches of Mercury (Hg); typical systems operate around 15-25"
HgV at the inlet.
10. Joints in medical gas copper tubing must be made using:
A. Soft solder
B. Glued fittings
C. Brazing with a BCuP series filler metal
D. Compression fittings
Rationale: Brazing provides a high-melting-point bond necessary for system integrity during fires.
(Note: For brevity, I will continue with key representative questions. In a real exam, these would
span all 100 slots.)
, CERTIFIED MEDICAL GAS INSPECTOR EXAM
2026 with answers in bold✅ and
rationale graded A+
11. During the brazing of medical gas pipes, what purge gas must be used?
A. Oil-free Dry Nitrogen
B. Oxygen
C. Carbon Dioxide
D. Argon
Rationale: Nitrogen displacement prevents the formation of copper oxide (scale) inside the pipe.
12. The Medical Air compressor must be located in a well-ventilated area and must be:
A. Liquid Ring only
B. Reciprocating only
C. Provided with at least two compressors (Duplex)
D. Oil-flooded without filters
Rationale: Redundancy is required for Category 1 systems to ensure continuous supply.
13. What is the color code for Medical Air?
A. Green
B. Yellow
C. Black
D. Blue
Rationale: Yellow is the standard color for Medical Air in the US.
14. Master alarm panels must be monitored ____:
A. Only during business hours
B. 24 hours a day
C. Once a week
D. Only when surgery is scheduled
Rationale: Master alarms must be at a 24-hour monitored location (e.g., security or engineering).
