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MEDICAL GAS 6010 INSTALLER EXAM PREP - VERIFIED
ANSWERS AND QUESTIONS - MOST RECENT EDITION 2026/2027
1. Which NFPA standard primarily governs medical gas systems in
healthcare facilities?
A. NFPA 70
B. NFPA 99
C. NFPA 101
D. NFPA 54
Answer: B. NFPA 99
Explanation: NFPA 99: Health Care Facilities Code is the primary standard
governing medical gas and vacuum systems in healthcare facilities.
2. What is the minimum working pressure for a medical oxygen piping
system?
A. 35 psi
B. 50 psi
C. 55 psi
D. 75 psi
Answer: C. 55 psi
Explanation: Medical oxygen systems must maintain a minimum working
pressure of 55 psi at all outlet locations per NFPA 99.
3. Under NFPA 99, which category of health care facility requires the
highest level of medical gas system reliability?
A. Category 1
B. Category 2
C. Category 3
D. Category 4
Answer: A. Category 1
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Explanation: Category 1 facilities are those where failure of equipment or
systems can cause major injury or death, requiring the highest reliability
standards.
4. Who is authorized to perform work on Level 1 medical gas systems
under NFPA 99?
A. Any licensed plumber
B. A NICU certified installer
C. A qualified installer credentialed per NFPA 99
D. Any HVAC technician
Answer: C. A qualified installer credentialed per NFPA 99
Explanation: NFPA 99 requires that Level 1 medical gas systems be installed
only by qualified individuals who have demonstrated competency through an
approved credentialing program.
5. What color is the piping for medical oxygen (O2)?
A. Blue
B. Green
C. Yellow
D. White
Answer: B. Green
Explanation: Medical oxygen piping is identified by the color green per CGA and
NFPA 99 standards.
6. What color coding is used for medical air piping?
A. White with black stripe
B. Yellow
C. Yellow and black
D. Yellow with black stripes
Answer: A. White with black stripe
Explanation: Medical air (Instrument Air) is identified as yellow with black stripes
or text per NFPA 99 labeling requirements.
7. What is the standard operating pressure for nitrous oxide (N2O) in a
medical gas system?
A. 45 psi
B. 50 psi
C. 55 psi
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D. 75 psi
Answer: C. 55 psi
Explanation: Nitrous oxide systems operate at 55 psi, same as oxygen, per
NFPA 99 standard operating pressures.
8. What is the standard pressure for medical vacuum in a healthcare
facility?
A. -10 to -14 in. Hg
B. -12 to -19 in. Hg
C. -15 to -19 in. Hg
D. -20 to -25 in. Hg
Answer: C. -15 to -19 in. Hg
Explanation: Medical vacuum systems must maintain between -15 and -19
inches of mercury (in. Hg) at all outlets per NFPA 99.
9. Which document must be completed before a new medical gas system is
placed into service?
A. Certificate of Need
B. Manufacturer's warranty
C. Verifier's report
D. Contractor's affidavit
Answer: C. Verifier's report
Explanation: A verifier's report (also called a verification certificate) must be
completed by a qualified verifier before a medical gas system is placed into
service per NFPA 99.
10. What is the minimum pipe size for a medical gas branch line to a single
outlet?
A. 1/4 inch
B. 3/8 inch
C. 1/2 inch
D. 3/4 inch
Answer: C. 1/2 inch
Explanation: Branch lines to individual outlets must be a minimum of 1/2 inch
diameter per NFPA 99 requirements.
SECTION 2: PIPING MATERIALS & INSTALLATION
Questions 11–30
11. What type of copper tubing is required for medical gas piping systems?
, Medical Gas 6010 Installer | Page:
A. Type M copper
B. Type L copper
C. Type K copper
D. ACR (Air Conditioning & Refrigeration) copper
Answer: D. ACR (Air Conditioning & Refrigeration) copper
Explanation: Medical gas systems require ACR (dehydrated and capped)
copper tubing that is specifically cleaned for oxygen service per NFPA 99 and
CGA standards.
12. What is the maximum oxygen content permitted in ASTM B819 copper
tubing used for medical gas?
A. The tubing must be oxygen-free
B. Less than 0.001% oxygen
C. No specific oxygen content limit
D. Less than 0.04% oxygen
Answer: C. No specific oxygen content limit
Explanation: ASTM B819 specifies the copper tube is seamless and cleaned for
oxygen service; it does not specify an oxygen content limit within the metal itself.
The key requirement is that it be internally clean and capped.
13. What soldering alloy is required when making brazed joints in medical
gas systems?
A. 50/50 tin-lead solder
B. 95/5 tin-antimony solder
C. BCuP brazing filler
D. AWS A5.8 BCuP-5 or BAg alloy
Answer: D. AWS A5.8 BCuP-5 or BAg alloy
Explanation: Medical gas piping joints must be brazed (not soldered) using
alloys meeting AWS A5.8, specifically BCuP or BAg series alloys that provide the
required joint integrity.
14. What purge gas must be used when brazing medical gas piping to
prevent internal oxidation?
A. Carbon dioxide
B. Nitrogen (oil-free, dry)
C. Argon
D. No purge is required
Answer: B. Nitrogen (oil-free, dry)
MEDICAL GAS 6010 INSTALLER EXAM PREP - VERIFIED
ANSWERS AND QUESTIONS - MOST RECENT EDITION 2026/2027
1. Which NFPA standard primarily governs medical gas systems in
healthcare facilities?
A. NFPA 70
B. NFPA 99
C. NFPA 101
D. NFPA 54
Answer: B. NFPA 99
Explanation: NFPA 99: Health Care Facilities Code is the primary standard
governing medical gas and vacuum systems in healthcare facilities.
2. What is the minimum working pressure for a medical oxygen piping
system?
A. 35 psi
B. 50 psi
C. 55 psi
D. 75 psi
Answer: C. 55 psi
Explanation: Medical oxygen systems must maintain a minimum working
pressure of 55 psi at all outlet locations per NFPA 99.
3. Under NFPA 99, which category of health care facility requires the
highest level of medical gas system reliability?
A. Category 1
B. Category 2
C. Category 3
D. Category 4
Answer: A. Category 1
, Medical Gas 6010 Installer | Page:
Explanation: Category 1 facilities are those where failure of equipment or
systems can cause major injury or death, requiring the highest reliability
standards.
4. Who is authorized to perform work on Level 1 medical gas systems
under NFPA 99?
A. Any licensed plumber
B. A NICU certified installer
C. A qualified installer credentialed per NFPA 99
D. Any HVAC technician
Answer: C. A qualified installer credentialed per NFPA 99
Explanation: NFPA 99 requires that Level 1 medical gas systems be installed
only by qualified individuals who have demonstrated competency through an
approved credentialing program.
5. What color is the piping for medical oxygen (O2)?
A. Blue
B. Green
C. Yellow
D. White
Answer: B. Green
Explanation: Medical oxygen piping is identified by the color green per CGA and
NFPA 99 standards.
6. What color coding is used for medical air piping?
A. White with black stripe
B. Yellow
C. Yellow and black
D. Yellow with black stripes
Answer: A. White with black stripe
Explanation: Medical air (Instrument Air) is identified as yellow with black stripes
or text per NFPA 99 labeling requirements.
7. What is the standard operating pressure for nitrous oxide (N2O) in a
medical gas system?
A. 45 psi
B. 50 psi
C. 55 psi
, Medical Gas 6010 Installer | Page:
D. 75 psi
Answer: C. 55 psi
Explanation: Nitrous oxide systems operate at 55 psi, same as oxygen, per
NFPA 99 standard operating pressures.
8. What is the standard pressure for medical vacuum in a healthcare
facility?
A. -10 to -14 in. Hg
B. -12 to -19 in. Hg
C. -15 to -19 in. Hg
D. -20 to -25 in. Hg
Answer: C. -15 to -19 in. Hg
Explanation: Medical vacuum systems must maintain between -15 and -19
inches of mercury (in. Hg) at all outlets per NFPA 99.
9. Which document must be completed before a new medical gas system is
placed into service?
A. Certificate of Need
B. Manufacturer's warranty
C. Verifier's report
D. Contractor's affidavit
Answer: C. Verifier's report
Explanation: A verifier's report (also called a verification certificate) must be
completed by a qualified verifier before a medical gas system is placed into
service per NFPA 99.
10. What is the minimum pipe size for a medical gas branch line to a single
outlet?
A. 1/4 inch
B. 3/8 inch
C. 1/2 inch
D. 3/4 inch
Answer: C. 1/2 inch
Explanation: Branch lines to individual outlets must be a minimum of 1/2 inch
diameter per NFPA 99 requirements.
SECTION 2: PIPING MATERIALS & INSTALLATION
Questions 11–30
11. What type of copper tubing is required for medical gas piping systems?
, Medical Gas 6010 Installer | Page:
A. Type M copper
B. Type L copper
C. Type K copper
D. ACR (Air Conditioning & Refrigeration) copper
Answer: D. ACR (Air Conditioning & Refrigeration) copper
Explanation: Medical gas systems require ACR (dehydrated and capped)
copper tubing that is specifically cleaned for oxygen service per NFPA 99 and
CGA standards.
12. What is the maximum oxygen content permitted in ASTM B819 copper
tubing used for medical gas?
A. The tubing must be oxygen-free
B. Less than 0.001% oxygen
C. No specific oxygen content limit
D. Less than 0.04% oxygen
Answer: C. No specific oxygen content limit
Explanation: ASTM B819 specifies the copper tube is seamless and cleaned for
oxygen service; it does not specify an oxygen content limit within the metal itself.
The key requirement is that it be internally clean and capped.
13. What soldering alloy is required when making brazed joints in medical
gas systems?
A. 50/50 tin-lead solder
B. 95/5 tin-antimony solder
C. BCuP brazing filler
D. AWS A5.8 BCuP-5 or BAg alloy
Answer: D. AWS A5.8 BCuP-5 or BAg alloy
Explanation: Medical gas piping joints must be brazed (not soldered) using
alloys meeting AWS A5.8, specifically BCuP or BAg series alloys that provide the
required joint integrity.
14. What purge gas must be used when brazing medical gas piping to
prevent internal oxidation?
A. Carbon dioxide
B. Nitrogen (oil-free, dry)
C. Argon
D. No purge is required
Answer: B. Nitrogen (oil-free, dry)
