NFPA 99 Medical Gas Systems Exam Prep – New Update
| Guaranteed Correct Answers Latest Updated 2026
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
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 .
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 _______________
Ammonia
After the piping system, the blow down test shall be done. Then the installer must perform
which of the following test?
Initial pressure test
Alarm panels and shutoff valves labeling shall be ____________ when modifications are made,
changing the areas serviced
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)
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 _______
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.
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.
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?
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
Simplex
Category 2 oxygen piping shall be at least 1 size larger than piping for _______?
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 ______.
Installer, representative of the system manufacturer, medical gas system verifier 6030
Category 3 piped gas and vacuum systems only ______ shall be permitted.
Minimal or no sedation
Category 3 vacuum source equipment shall be obtained from, and be installed under the
supervision of the __________?
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?
1
Cylinders in service and in storage shall be __________ secured and located to prevent falling or
being knocked over.
Individually
Dental air sources for a compressor intake located inside the building shall be located within a
space where no _______ are stored or used.
Chemical based materials, patient medical treatment, discharge from category 3 vacuum system
| Guaranteed Correct Answers Latest Updated 2026
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
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 .
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 _______________
Ammonia
After the piping system, the blow down test shall be done. Then the installer must perform
which of the following test?
Initial pressure test
Alarm panels and shutoff valves labeling shall be ____________ when modifications are made,
changing the areas serviced
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)
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 _______
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.
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.
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?
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
Simplex
Category 2 oxygen piping shall be at least 1 size larger than piping for _______?
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 ______.
Installer, representative of the system manufacturer, medical gas system verifier 6030
Category 3 piped gas and vacuum systems only ______ shall be permitted.
Minimal or no sedation
Category 3 vacuum source equipment shall be obtained from, and be installed under the
supervision of the __________?
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?
1
Cylinders in service and in storage shall be __________ secured and located to prevent falling or
being knocked over.
Individually
Dental air sources for a compressor intake located inside the building shall be located within a
space where no _______ are stored or used.
Chemical based materials, patient medical treatment, discharge from category 3 vacuum system
