FDNY G-46 EXAM –TEST PREP (2025/2026) –
VERIFIED QUESTIONS AND ANSWERS
1. Non-flammable gas: Gas at 68°F or less at 14.7 pounds per square inch absolute (psia) of pressure
which:
Is NOT ignitable at 14.7 psia when in mixture of 13 percent or less by volume with air, in accordance w
testing procedures set forth in ASTM E681 OR DOES NOT have a flammable range at 14.7 psia with ai
of at least 12 percent, regardless of lower limit, in accordance with testing procedures set forth in ASTM
E681.
2. Ammonia: Classified by the Department of Transportation as nonflammable. However, vapor in
high concentrations (16-25% by weight in air) will burn. Unlikely to ever happen except in confined
spaces or in the proximity of a large spill.
3. Handling & Use of Non-Flammable Compressed Gases: In quantities requir- ing a permit, including
non-piped medical gas systems, shall be under the personal supervision of a person holding G-46 COF.
4. Storage of Non-Flammable Compressed Gases: The storage of Compressed gases in quantities
requiring a permit, including medical gases that are not piped, shall be under the general supervision of
a person holding the G-46 COF.
5. Filling of Containers with Non-Flammable Compressed Gases: The transfer of nonflammable
compressed gases between containers shall be performed by a person holding a G-46 COF.
6. Site-specific permit: Authorizes the permit holder to store, handle, and use non- flammable
compressed gases at a specific premises or location. May be permanent OR temporary. Permanent
permits are valid for 12 months and every permit or renewal requires an inspection. Temporary permits
may be valid from one day to 12 months depending on the construction or operation needed.
7. Citywide permit: Authorizes permit holder to store, handle, use, sell or transport nonflammable
gases, or conduct an operation on a citywide basis, for which a permit is required by the fire department. A
citywide permit is valid to conduct an operation at one of more locations provided the duration of such
activity at any individual location does not exceed 30 days. Any periods above 30 days require a site-
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, specific permit.
8. Quantities of Gases requiring permit (Amount in SCF): Corrosive - 400 SCF
Nonflammable and nonoxidizing (besides CO2) - 3,000 SCF CO2 - 4,500 SCF
Oxidizing - 504 SCF Highly
Toxic - Any Amount
Toxic - Any Amount
Unstable (reactive) - Any Amount
9. NFPA 704 Diamond Sign Explanation: The transport of hazardous materials is accompanied by
the use of US DOT compliant placards and labels to assist identification of hazardous materials on
the roadway, railways, waterway and in the air. In a similar manner the storage, handling & use of
hazardous materials is accompanied in the fire code by a requirement for the use of consistent
signage
to alert people, including first responders, to the Prescence of hazardous materials in a facility. The inten
of the signage is to provide an indication of both the type of hazardous materials present and the relative
degree of harm that then material can pose. Uses symbols, colors, and numbers to communicate this in a
visual manner. The triggering amount for the sign requirement is the amount required for a permit.
10. Nonliquified compressed gas: Gases, other than those in a solution, that are in a packaging under the
charged pressure and are entirely gaseous at a temperature of 68°F.
11. Liquified compressed gas: Gases that, in a packaging under the charged pressure, are
partially liquid at 68°F.
12. Compressed gases in solution: Nonliquified gases that are dissolved in a solvent.
13. Compressed gas mixtures: A mixture of two or more compressed gases contained in a single
packaging, the hazard properties of which are represented by the properties of the mixture as a
whole.
14. Container: For solid and liquid hazardous materials, a vessel of 60 gallons or less in capacity used
for storage or transportation. For compressed gases, a cylinder, pressure vessel or tank designed for
pressures greater than one atmosphere at 68°F
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VERIFIED QUESTIONS AND ANSWERS
1. Non-flammable gas: Gas at 68°F or less at 14.7 pounds per square inch absolute (psia) of pressure
which:
Is NOT ignitable at 14.7 psia when in mixture of 13 percent or less by volume with air, in accordance w
testing procedures set forth in ASTM E681 OR DOES NOT have a flammable range at 14.7 psia with ai
of at least 12 percent, regardless of lower limit, in accordance with testing procedures set forth in ASTM
E681.
2. Ammonia: Classified by the Department of Transportation as nonflammable. However, vapor in
high concentrations (16-25% by weight in air) will burn. Unlikely to ever happen except in confined
spaces or in the proximity of a large spill.
3. Handling & Use of Non-Flammable Compressed Gases: In quantities requir- ing a permit, including
non-piped medical gas systems, shall be under the personal supervision of a person holding G-46 COF.
4. Storage of Non-Flammable Compressed Gases: The storage of Compressed gases in quantities
requiring a permit, including medical gases that are not piped, shall be under the general supervision of
a person holding the G-46 COF.
5. Filling of Containers with Non-Flammable Compressed Gases: The transfer of nonflammable
compressed gases between containers shall be performed by a person holding a G-46 COF.
6. Site-specific permit: Authorizes the permit holder to store, handle, and use non- flammable
compressed gases at a specific premises or location. May be permanent OR temporary. Permanent
permits are valid for 12 months and every permit or renewal requires an inspection. Temporary permits
may be valid from one day to 12 months depending on the construction or operation needed.
7. Citywide permit: Authorizes permit holder to store, handle, use, sell or transport nonflammable
gases, or conduct an operation on a citywide basis, for which a permit is required by the fire department. A
citywide permit is valid to conduct an operation at one of more locations provided the duration of such
activity at any individual location does not exceed 30 days. Any periods above 30 days require a site-
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, specific permit.
8. Quantities of Gases requiring permit (Amount in SCF): Corrosive - 400 SCF
Nonflammable and nonoxidizing (besides CO2) - 3,000 SCF CO2 - 4,500 SCF
Oxidizing - 504 SCF Highly
Toxic - Any Amount
Toxic - Any Amount
Unstable (reactive) - Any Amount
9. NFPA 704 Diamond Sign Explanation: The transport of hazardous materials is accompanied by
the use of US DOT compliant placards and labels to assist identification of hazardous materials on
the roadway, railways, waterway and in the air. In a similar manner the storage, handling & use of
hazardous materials is accompanied in the fire code by a requirement for the use of consistent
signage
to alert people, including first responders, to the Prescence of hazardous materials in a facility. The inten
of the signage is to provide an indication of both the type of hazardous materials present and the relative
degree of harm that then material can pose. Uses symbols, colors, and numbers to communicate this in a
visual manner. The triggering amount for the sign requirement is the amount required for a permit.
10. Nonliquified compressed gas: Gases, other than those in a solution, that are in a packaging under the
charged pressure and are entirely gaseous at a temperature of 68°F.
11. Liquified compressed gas: Gases that, in a packaging under the charged pressure, are
partially liquid at 68°F.
12. Compressed gases in solution: Nonliquified gases that are dissolved in a solvent.
13. Compressed gas mixtures: A mixture of two or more compressed gases contained in a single
packaging, the hazard properties of which are represented by the properties of the mixture as a
whole.
14. Container: For solid and liquid hazardous materials, a vessel of 60 gallons or less in capacity used
for storage or transportation. For compressed gases, a cylinder, pressure vessel or tank designed for
pressures greater than one atmosphere at 68°F
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