Medical Gas Refresher Certification Exam
2026/2027 – Actual Exam- Questions with
100% Verified Correct Answers Based on
current NFPA 99 (2024 edition – still
authoritative in 2026/2027) Graded A+ | Pass
Guaranteed
Question 1 According to NFPA 99, how often must medical gas and vacuum systems be
inspected and tested after initial verification?
Answer: At intervals not exceeding 36 months (3 years)
Rationale: NFPA 99 § 5.1.14.4 requires periodic testing & inspection at least every 36 months
after the initial verification.
Question 2 What is the required purity level for oxygen delivered from a medical gas system
during periodic testing?
Answer: ≥99.0%
Rationale: NFPA 99 § 5.1.14.4.5 continues to require oxygen purity ≥99.0% during routine
verification testing.
Question 3 During a periodic inspection, what is the maximum allowable oxygen concentration
in medical air?
Answer: 23% ± 2% (19.5% to 23.5%)
Rationale: NFPA 99 § 5.1.14.4.6 maintains the medical air oxygen content requirement of
19.5%–23.5%.
, Question 4 Which document must be maintained on-site and be available for review during a
periodic inspection?
Answer: The most recent inspection, testing & maintenance report
Rationale: NFPA 99 § 5.1.14.4 requires the latest report to be kept on-site and available.
Question 5 What is the required action if a medical gas outlet fails the periodic pressure test?
Answer: Immediately take the outlet out of service and repair/replace it
Rationale: NFPA 99 § 5.1.14.4.3 requires immediate removal from service of any component
that fails testing.
Question 6 How frequently must master alarm panels be functionally tested?
Answer: Monthly
Rationale: NFPA 99 § 5.1.14.3 requires monthly testing of master, area, and local alarm
systems.
Question 7 During periodic testing, what is the minimum vacuum level that a medical vacuum
system must achieve?
Answer: At least 14 inches Hg (475 mm Hg) at the most remote outlet
Rationale: NFPA 99 § 5.1.14.4.7 continues to require vacuum systems to maintain ≥14 inHg at
the farthest outlet.
Question 8 What must be done if a medical gas system shows evidence of particulate
contamination during periodic inspection?
Answer: The system must be purged and retested until particulate levels are acceptable
Rationale: NFPA 99 § 5.1.14.4.9 requires purging and retesting when contamination is detected.
2026/2027 – Actual Exam- Questions with
100% Verified Correct Answers Based on
current NFPA 99 (2024 edition – still
authoritative in 2026/2027) Graded A+ | Pass
Guaranteed
Question 1 According to NFPA 99, how often must medical gas and vacuum systems be
inspected and tested after initial verification?
Answer: At intervals not exceeding 36 months (3 years)
Rationale: NFPA 99 § 5.1.14.4 requires periodic testing & inspection at least every 36 months
after the initial verification.
Question 2 What is the required purity level for oxygen delivered from a medical gas system
during periodic testing?
Answer: ≥99.0%
Rationale: NFPA 99 § 5.1.14.4.5 continues to require oxygen purity ≥99.0% during routine
verification testing.
Question 3 During a periodic inspection, what is the maximum allowable oxygen concentration
in medical air?
Answer: 23% ± 2% (19.5% to 23.5%)
Rationale: NFPA 99 § 5.1.14.4.6 maintains the medical air oxygen content requirement of
19.5%–23.5%.
, Question 4 Which document must be maintained on-site and be available for review during a
periodic inspection?
Answer: The most recent inspection, testing & maintenance report
Rationale: NFPA 99 § 5.1.14.4 requires the latest report to be kept on-site and available.
Question 5 What is the required action if a medical gas outlet fails the periodic pressure test?
Answer: Immediately take the outlet out of service and repair/replace it
Rationale: NFPA 99 § 5.1.14.4.3 requires immediate removal from service of any component
that fails testing.
Question 6 How frequently must master alarm panels be functionally tested?
Answer: Monthly
Rationale: NFPA 99 § 5.1.14.3 requires monthly testing of master, area, and local alarm
systems.
Question 7 During periodic testing, what is the minimum vacuum level that a medical vacuum
system must achieve?
Answer: At least 14 inches Hg (475 mm Hg) at the most remote outlet
Rationale: NFPA 99 § 5.1.14.4.7 continues to require vacuum systems to maintain ≥14 inHg at
the farthest outlet.
Question 8 What must be done if a medical gas system shows evidence of particulate
contamination during periodic inspection?
Answer: The system must be purged and retested until particulate levels are acceptable
Rationale: NFPA 99 § 5.1.14.4.9 requires purging and retesting when contamination is detected.
