Covering NFPA 99 | ASSE 6010 | Brazing | Testing | Safety | Components |
Design
2026 Edition
Q1. What standard governs the installation of medical gas systems
in healthcare facilities?
A: NFPA 99: Health Care Facilities Code governs the design,
installation, testing, and maintenance of medical gas and vacuum
systems in healthcare facilities.
Q2. What edition of NFPA 99 is currently referenced for medical gas
installations?
A: NFPA 99-2021 (or the edition adopted by the local Authority Having
Jurisdiction – AHJ) is the primary referenced standard for medical gas
installations.
Q3. What does NFPA stand for in the context of medical gas
standards?
A: NFPA stands for National Fire Protection Association, the body that
develops and publishes the NFPA 99 Health Care Facilities Code.
Medical Gas 6010 Installer – 2026 Practice Tests | Page 1 of 57
,Q4. Who is the Authority Having Jurisdiction (AHJ) in a medical gas
project?
A: The AHJ is the organization, office, or individual responsible for
enforcing requirements of a code or standard, or their duly authorized
representative. This may be a state agency, local building official, or
accreditation body.
Q5. What category of health care occupancy requires Level 1
medical gas systems?
A: Category 1 spaces where loss of a system would cause major injury
or death to patients or staff require Level 1 medical gas systems (e.g.,
operating rooms, ICUs).
Q6. Define Level 2 medical gas systems under NFPA 99.
A: Level 2 systems serve Category 2 spaces where loss of a system
could cause minor injury or interruption of patient care. These include
areas such as patient rooms and examination rooms.
Q7. What is the minimum required purity for medical-grade
oxygen?
A: Medical-grade oxygen must be at least 99.0% pure (USP grade) as
specified by the United States Pharmacopeia (USP) and NFPA 99.
Q8. What certification must a medical gas installer hold to legally
perform Level 1 system work?
A: An installer must hold a Medical Gas Installer certification from ASSE
(American Society of Sanitary Engineering) Series 6010, or equivalent
certification recognized by the AHJ.
Q9. Which ASSE standard covers medical gas installer
qualifications?
Medical Gas 6010 Installer – 2026 Practice Tests | Page 2 of 57
,A: ASSE Series 6000 covers medical gas personnel qualifications.
Specifically, ASSE 6010 covers Medical Gas Systems Installers.
Q10. What does ASSE 6010 certification require an installer to
demonstrate?
A: ASSE 6010 requires installers to demonstrate knowledge of NFPA
99, proper installation techniques, brazing proficiency, system testing
procedures, and component identification for medical gas systems.
Q11. What is the maximum allowable pressure drop in a medical
oxygen distribution system?
A: The maximum allowable pressure drop in a medical oxygen
distribution system from the source to any outlet is typically 5 psig (per
NFPA 99 guidelines), though specific requirements depend on system
design.
Q12. Which gas is color-coded green in medical gas systems?
A: Oxygen (O₂) is color-coded green in medical gas systems in the
United States, per NFPA 99 and CGA standards.
Q13. What color is used for medical-grade nitrous oxide piping?
A: Nitrous oxide (N₂O) is color-coded blue in U.S. medical gas systems.
Q14. What color coding is used for medical air in the United States?
A: Medical air is color-coded yellow in the United States per NFPA 99.
Q15. What color is carbon dioxide (CO₂) medical gas piping?
A: Carbon dioxide (CO₂) is color-coded gray in U.S. medical gas
systems.
Medical Gas 6010 Installer – 2026 Practice Tests | Page 3 of 57
, Q16. What is the color code for medical vacuum (suction) systems?
A: Medical vacuum systems are color-coded white in the United States
per NFPA 99.
Q17. What color identifies nitrogen (N₂) in a medical gas system?
A: Nitrogen (N₂) is color-coded black in U.S. medical gas piping
systems.
Q18. What does the term 'zone valve' mean in a medical gas
system?
A: A zone valve is a shutoff valve that isolates a specific area or zone of
a medical gas or vacuum system, allowing individual sections to be shut
down without affecting the entire system.
Q19. Where must zone valves be installed relative to the areas they
serve?
A: Zone valves must be installed outside the rooms or areas they serve,
typically in corridors or valve boxes accessible to staff but not to patients,
so the area can be isolated in an emergency.
Q20. What is a pressure/demand regulator in a medical gas
system?
A: A pressure/demand regulator reduces the high-pressure source gas
to a safe, usable working pressure for patient use outlets, maintaining
consistent delivery pressure regardless of flow demand.
Q21. What is the standard operating pressure for most medical gas
outlets at the point of use?
A: Most medical gas outlets operate at 50–55 psig (pounds per square
inch gauge) at the point of use, as specified by NFPA 99.
Medical Gas 6010 Installer – 2026 Practice Tests | Page 4 of 57
Design
2026 Edition
Q1. What standard governs the installation of medical gas systems
in healthcare facilities?
A: NFPA 99: Health Care Facilities Code governs the design,
installation, testing, and maintenance of medical gas and vacuum
systems in healthcare facilities.
Q2. What edition of NFPA 99 is currently referenced for medical gas
installations?
A: NFPA 99-2021 (or the edition adopted by the local Authority Having
Jurisdiction – AHJ) is the primary referenced standard for medical gas
installations.
Q3. What does NFPA stand for in the context of medical gas
standards?
A: NFPA stands for National Fire Protection Association, the body that
develops and publishes the NFPA 99 Health Care Facilities Code.
Medical Gas 6010 Installer – 2026 Practice Tests | Page 1 of 57
,Q4. Who is the Authority Having Jurisdiction (AHJ) in a medical gas
project?
A: The AHJ is the organization, office, or individual responsible for
enforcing requirements of a code or standard, or their duly authorized
representative. This may be a state agency, local building official, or
accreditation body.
Q5. What category of health care occupancy requires Level 1
medical gas systems?
A: Category 1 spaces where loss of a system would cause major injury
or death to patients or staff require Level 1 medical gas systems (e.g.,
operating rooms, ICUs).
Q6. Define Level 2 medical gas systems under NFPA 99.
A: Level 2 systems serve Category 2 spaces where loss of a system
could cause minor injury or interruption of patient care. These include
areas such as patient rooms and examination rooms.
Q7. What is the minimum required purity for medical-grade
oxygen?
A: Medical-grade oxygen must be at least 99.0% pure (USP grade) as
specified by the United States Pharmacopeia (USP) and NFPA 99.
Q8. What certification must a medical gas installer hold to legally
perform Level 1 system work?
A: An installer must hold a Medical Gas Installer certification from ASSE
(American Society of Sanitary Engineering) Series 6010, or equivalent
certification recognized by the AHJ.
Q9. Which ASSE standard covers medical gas installer
qualifications?
Medical Gas 6010 Installer – 2026 Practice Tests | Page 2 of 57
,A: ASSE Series 6000 covers medical gas personnel qualifications.
Specifically, ASSE 6010 covers Medical Gas Systems Installers.
Q10. What does ASSE 6010 certification require an installer to
demonstrate?
A: ASSE 6010 requires installers to demonstrate knowledge of NFPA
99, proper installation techniques, brazing proficiency, system testing
procedures, and component identification for medical gas systems.
Q11. What is the maximum allowable pressure drop in a medical
oxygen distribution system?
A: The maximum allowable pressure drop in a medical oxygen
distribution system from the source to any outlet is typically 5 psig (per
NFPA 99 guidelines), though specific requirements depend on system
design.
Q12. Which gas is color-coded green in medical gas systems?
A: Oxygen (O₂) is color-coded green in medical gas systems in the
United States, per NFPA 99 and CGA standards.
Q13. What color is used for medical-grade nitrous oxide piping?
A: Nitrous oxide (N₂O) is color-coded blue in U.S. medical gas systems.
Q14. What color coding is used for medical air in the United States?
A: Medical air is color-coded yellow in the United States per NFPA 99.
Q15. What color is carbon dioxide (CO₂) medical gas piping?
A: Carbon dioxide (CO₂) is color-coded gray in U.S. medical gas
systems.
Medical Gas 6010 Installer – 2026 Practice Tests | Page 3 of 57
, Q16. What is the color code for medical vacuum (suction) systems?
A: Medical vacuum systems are color-coded white in the United States
per NFPA 99.
Q17. What color identifies nitrogen (N₂) in a medical gas system?
A: Nitrogen (N₂) is color-coded black in U.S. medical gas piping
systems.
Q18. What does the term 'zone valve' mean in a medical gas
system?
A: A zone valve is a shutoff valve that isolates a specific area or zone of
a medical gas or vacuum system, allowing individual sections to be shut
down without affecting the entire system.
Q19. Where must zone valves be installed relative to the areas they
serve?
A: Zone valves must be installed outside the rooms or areas they serve,
typically in corridors or valve boxes accessible to staff but not to patients,
so the area can be isolated in an emergency.
Q20. What is a pressure/demand regulator in a medical gas
system?
A: A pressure/demand regulator reduces the high-pressure source gas
to a safe, usable working pressure for patient use outlets, maintaining
consistent delivery pressure regardless of flow demand.
Q21. What is the standard operating pressure for most medical gas
outlets at the point of use?
A: Most medical gas outlets operate at 50–55 psig (pounds per square
inch gauge) at the point of use, as specified by NFPA 99.
Medical Gas 6010 Installer – 2026 Practice Tests | Page 4 of 57
