NFPA 99 Medical Gas Edition Most
Recent exam COMPLETE (2025) EXAM
Questions and Answers (Verified
Answers) Latest Update 2026
What additional characteristic must station outlets/inlets have if not fully
accessible?
Gas-specific connections with positive locking mechanisms.
What is an informative NFPA standard that contains nonmandatory provisions?
Annex.
What must be documented for temporary installations of medical surgical
vacuum systems?
A process for inspection.
Who must witness the initial pressure tests performed by the installing
contractor?
ASSE 6020 inspector, an ASSE 6030 verifier, or the authority having jurisdiction.
What should be maintained in the piping system during and after installation?
A sealed nitrogen atmosphere to prevent ambient air or moisture from entering.
Where must WAGD inlets be provided?
In all locations where local anesthesia is intended to be administered.
What is the purpose of manifolds for gas cylinders?
To alternate the two headers during normal operation.
What should multiple vacuum pumps be sized to minimize?
, Back pressure in accordance with the pump manufacturer's recommendations.
What must valves in medical gas and vacuum piping systems be tested for?
Proper operation.
What are the requirements for central supply systems for positive-pressure
gases?
They must be protected from prolonged soil contact, well drained, and secured.
How should each section of piping in medical gas systems be pressure tested?
With the source valve remaining closed after installation of station outlet/inlet rough-in
assemblies.
What is the minimum reserve supply required for hyperbaric care oxygen supply?
30 minutes
What type of signal should manifolds for gas cylinders have?
A master signal that indicates the operating status and activates an indicator at alarm
panels.
What is an oxygen concentrator unit?
An engineered assembly that raises the concentration of oxygen, providing it as a drug
product.
When may two or more vacuum piping systems be interconnected during
installation?
Only when the contents are the same and an inline valve has been installed between
the systems.
Where should the main line valve be located?
Behind a locked accessed door downstream of the source valve.
Recent exam COMPLETE (2025) EXAM
Questions and Answers (Verified
Answers) Latest Update 2026
What additional characteristic must station outlets/inlets have if not fully
accessible?
Gas-specific connections with positive locking mechanisms.
What is an informative NFPA standard that contains nonmandatory provisions?
Annex.
What must be documented for temporary installations of medical surgical
vacuum systems?
A process for inspection.
Who must witness the initial pressure tests performed by the installing
contractor?
ASSE 6020 inspector, an ASSE 6030 verifier, or the authority having jurisdiction.
What should be maintained in the piping system during and after installation?
A sealed nitrogen atmosphere to prevent ambient air or moisture from entering.
Where must WAGD inlets be provided?
In all locations where local anesthesia is intended to be administered.
What is the purpose of manifolds for gas cylinders?
To alternate the two headers during normal operation.
What should multiple vacuum pumps be sized to minimize?
, Back pressure in accordance with the pump manufacturer's recommendations.
What must valves in medical gas and vacuum piping systems be tested for?
Proper operation.
What are the requirements for central supply systems for positive-pressure
gases?
They must be protected from prolonged soil contact, well drained, and secured.
How should each section of piping in medical gas systems be pressure tested?
With the source valve remaining closed after installation of station outlet/inlet rough-in
assemblies.
What is the minimum reserve supply required for hyperbaric care oxygen supply?
30 minutes
What type of signal should manifolds for gas cylinders have?
A master signal that indicates the operating status and activates an indicator at alarm
panels.
What is an oxygen concentrator unit?
An engineered assembly that raises the concentration of oxygen, providing it as a drug
product.
When may two or more vacuum piping systems be interconnected during
installation?
Only when the contents are the same and an inline valve has been installed between
the systems.
Where should the main line valve be located?
Behind a locked accessed door downstream of the source valve.
