2026 NFPA 99 Medical Gas Questions
and Correct Answers Guaranteed Pass
A manual reset local alarm that indicates when the capacity of the instrument air central supply
system not in use is less than the equivalent capacity of - <CORRECT ANSWER >>One
compressor
After a final tie - In on an active vacuum system , each vacuum joints shall be tested with a leak
detector or other means that will allow detectant on an active vacuum system . - <CORRECT
ANSWER >>Ultrasonic
After the final tie-in each joint shall be leak tested by the source gas. New work and the existing
system at the normal operating pressure shall be leak checked with a leak detectant that is safe
for use with oxygen and does NOT contain _______________ - <CORRECT ANSWER >>Ammonia
After the piping system, the blow down test shall be done. Then the installer must perform
which of the following test? - <CORRECT ANSWER >>Initial pressure test
Alarm panels and shutoff valves labeling shall be ____________ when modifications are made,
changing the areas serviced - <CORRECT ANSWER >>Updated
All gas outlets with gauge pressure of 345 kPa (50 psi), including, but not limited to, oxygen,
nitrous oxide, medical air, and carbon dioxide, shall deliver 100 SLPM (3.5 SCFM) with a
pressure drop of not more than 35 kPa (______) and static pressure of 345 kPa to 380 kPa
(50psi to 55 psi) - <CORRECT ANSWER >>5 psi
Area alarms shall be tested to verify the warning signals for all vital life support and critical care
areas if the pressure in the piping system increases or decreases by _______ - <CORRECT
ANSWER >>20%
,At the sample port a demand of approximated 25% load shall be created to cause the
compressors to cycle on and off continuously and the dryers to operate for the ______ period. -
<CORRECT ANSWER >>12 hour
Before the piping system is put into use, who is responsible for the ascertaining that the gas
delivered to the outlet/inlet has the proper labels and connecting fittings. - <CORRECT ANSWER
>>Facility authority
Breached portions of the systems subject to inspection and testing shall be confined to only the
specific altered zone or area that is downstream for pressure gases at the point of intrusion.
Where a system shall be declared breached? - <CORRECT ANSWER >>Physical separation of
pipeline, system component removal, replacement or addition of system components
Category 2 & 3 medical has and vacuum systems are allowed to be ________ on the amount of
compressors and vacuum pumps - <CORRECT ANSWER >>Simplex
Category 2 oxygen piping shall be at least 1 size larger than piping for _______? - <CORRECT
ANSWER >>Nitrous oxide
Category 3 gas-power device supply systems, vacuum systems and scavenging systems. The
initial tests shall be performed before the final tests shall be conducted by ______. - <CORRECT
ANSWER >>Installer, representative of the system manufacturer, medical gas system verifier
6030
Category 3 piped gas and vacuum systems only ______ shall be permitted. - <CORRECT
ANSWER >>Minimal or no sedation
Category 3 vacuum source equipment shall be obtained from, and be installed under the
supervision of the __________? - <CORRECT ANSWER >>Manufacturer, supplier, who is familiar
with its installation, operation and use
, Category 2 & 3 medical gas systems are required to have how many alarm panels? - <CORRECT
ANSWER >>1
Cylinders in service and in storage shall be __________ secured and located to prevent falling
or being knocked over. - <CORRECT ANSWER >>Individually
Dental air sources for a compressor intake located inside the building shall be located within a
space where no _______ are stored or used. - <CORRECT ANSWER >>Chemical based materials,
patient medical treatment, discharge from category 3 vacuum system
Dental applications that use flexible connectors shall have a gauge pressure rating not less than
_______ - <CORRECT ANSWER >>1000 psi
Distribution piping for support gas systems (nitrogen and instrument air) shall be ________
type "L" copper tube - <CORRECT ANSWER >>ASTM B819
During the initial pressure test, the source shutoff valve shall remain closed and the test
pressure for pressure gases shall be 1.5 times the system working pressure, but not less than
______ - <CORRECT ANSWER >>150 psi
Each health care facility shall designate one or more individuals to be the _______ with respect
to the facility's medical gas and vacuum systems. - <CORRECT ANSWER >>Responsible facility
authority
Final line filters for instrument air shall be equipped with a continuous visual indicator showing
the status of the filter ________? - <CORRECT ANSWER >>Element life indicator
Final line filters for instrument air shall be rated for a minimum of ______ efficiency at _____
micron. - <CORRECT ANSWER >>98% at .01
and Correct Answers Guaranteed Pass
A manual reset local alarm that indicates when the capacity of the instrument air central supply
system not in use is less than the equivalent capacity of - <CORRECT ANSWER >>One
compressor
After a final tie - In on an active vacuum system , each vacuum joints shall be tested with a leak
detector or other means that will allow detectant on an active vacuum system . - <CORRECT
ANSWER >>Ultrasonic
After the final tie-in each joint shall be leak tested by the source gas. New work and the existing
system at the normal operating pressure shall be leak checked with a leak detectant that is safe
for use with oxygen and does NOT contain _______________ - <CORRECT ANSWER >>Ammonia
After the piping system, the blow down test shall be done. Then the installer must perform
which of the following test? - <CORRECT ANSWER >>Initial pressure test
Alarm panels and shutoff valves labeling shall be ____________ when modifications are made,
changing the areas serviced - <CORRECT ANSWER >>Updated
All gas outlets with gauge pressure of 345 kPa (50 psi), including, but not limited to, oxygen,
nitrous oxide, medical air, and carbon dioxide, shall deliver 100 SLPM (3.5 SCFM) with a
pressure drop of not more than 35 kPa (______) and static pressure of 345 kPa to 380 kPa
(50psi to 55 psi) - <CORRECT ANSWER >>5 psi
Area alarms shall be tested to verify the warning signals for all vital life support and critical care
areas if the pressure in the piping system increases or decreases by _______ - <CORRECT
ANSWER >>20%
,At the sample port a demand of approximated 25% load shall be created to cause the
compressors to cycle on and off continuously and the dryers to operate for the ______ period. -
<CORRECT ANSWER >>12 hour
Before the piping system is put into use, who is responsible for the ascertaining that the gas
delivered to the outlet/inlet has the proper labels and connecting fittings. - <CORRECT ANSWER
>>Facility authority
Breached portions of the systems subject to inspection and testing shall be confined to only the
specific altered zone or area that is downstream for pressure gases at the point of intrusion.
Where a system shall be declared breached? - <CORRECT ANSWER >>Physical separation of
pipeline, system component removal, replacement or addition of system components
Category 2 & 3 medical has and vacuum systems are allowed to be ________ on the amount of
compressors and vacuum pumps - <CORRECT ANSWER >>Simplex
Category 2 oxygen piping shall be at least 1 size larger than piping for _______? - <CORRECT
ANSWER >>Nitrous oxide
Category 3 gas-power device supply systems, vacuum systems and scavenging systems. The
initial tests shall be performed before the final tests shall be conducted by ______. - <CORRECT
ANSWER >>Installer, representative of the system manufacturer, medical gas system verifier
6030
Category 3 piped gas and vacuum systems only ______ shall be permitted. - <CORRECT
ANSWER >>Minimal or no sedation
Category 3 vacuum source equipment shall be obtained from, and be installed under the
supervision of the __________? - <CORRECT ANSWER >>Manufacturer, supplier, who is familiar
with its installation, operation and use
, Category 2 & 3 medical gas systems are required to have how many alarm panels? - <CORRECT
ANSWER >>1
Cylinders in service and in storage shall be __________ secured and located to prevent falling
or being knocked over. - <CORRECT ANSWER >>Individually
Dental air sources for a compressor intake located inside the building shall be located within a
space where no _______ are stored or used. - <CORRECT ANSWER >>Chemical based materials,
patient medical treatment, discharge from category 3 vacuum system
Dental applications that use flexible connectors shall have a gauge pressure rating not less than
_______ - <CORRECT ANSWER >>1000 psi
Distribution piping for support gas systems (nitrogen and instrument air) shall be ________
type "L" copper tube - <CORRECT ANSWER >>ASTM B819
During the initial pressure test, the source shutoff valve shall remain closed and the test
pressure for pressure gases shall be 1.5 times the system working pressure, but not less than
______ - <CORRECT ANSWER >>150 psi
Each health care facility shall designate one or more individuals to be the _______ with respect
to the facility's medical gas and vacuum systems. - <CORRECT ANSWER >>Responsible facility
authority
Final line filters for instrument air shall be equipped with a continuous visual indicator showing
the status of the filter ________? - <CORRECT ANSWER >>Element life indicator
Final line filters for instrument air shall be rated for a minimum of ______ efficiency at _____
micron. - <CORRECT ANSWER >>98% at .01
