NFPA 54 National Fuel Gas Code With
Correct Definitions 2025
Approved -(correct answer)Acceptable to the authority having jurisdiction. Authority Having
Jurisdiction (AHJ) -(correct answer)An organization, office, or individual responsible for
enforcing the requirements of a code or standard, or for approving equipment, materials, an
installation, or a procedure. Labeled -(correct answer)Equipment or materials to which has
been attached a label, symbol, or other identifying mark of an organization that is acceptable
to the authority having jurisdiction and concerned with product evaluation, that maintains
periodic inspection of production of labeled equipment or materials, and by whose labeling the
manufacturer indicates compliance with appropriate standards or performance in a specified
manner. listed -(correct answer)Equipment, materials, or services included in a list published
by an organization that is acceptable to the authority having jurisdiction and concerned with
evaluation of products or services, that maintains periodic inspection of production of listed
equipment or materials or periodic evaluation of services, and whose listing states that either
the equipment, material, or service meets appropriate designated standards or has been
tested and found suitable for a specified purpose. Shall -(correct answer)Indicates a
mandatory requirement. Accessible -(correct answer)Having access to but which first requires
the removal of a panel, door, or similar covering of the item described. Readily Accessible
-(correct answer)Having direct access without the need of removing or moving any panel, door,
or similar covering of the item described. Air -(correct answer)Circulating, Dilution, Excess,
Primary Circulating Air -(correct answer)Air for cooling, heating, or ventilation distributed to
habitable spaces Dilution Air -(correct answer)Air that enters a draft hood or draft regulator and
mixes with the flue gases. Excess Air -(correct answer)Air that passes through the combustion
chamber and the appliance flues in excess of that which is theoretically required for complete
combustion Primary Air -(correct answer)The air introduced into a burner that mixes with the
gas before it reaches the port or ports Air Conditioning -(correct answer)The treatment of air so
Correct Definitions 2025
Approved -(correct answer)Acceptable to the authority having jurisdiction. Authority Having
Jurisdiction (AHJ) -(correct answer)An organization, office, or individual responsible for
enforcing the requirements of a code or standard, or for approving equipment, materials, an
installation, or a procedure. Labeled -(correct answer)Equipment or materials to which has
been attached a label, symbol, or other identifying mark of an organization that is acceptable
to the authority having jurisdiction and concerned with product evaluation, that maintains
periodic inspection of production of labeled equipment or materials, and by whose labeling the
manufacturer indicates compliance with appropriate standards or performance in a specified
manner. listed -(correct answer)Equipment, materials, or services included in a list published
by an organization that is acceptable to the authority having jurisdiction and concerned with
evaluation of products or services, that maintains periodic inspection of production of listed
equipment or materials or periodic evaluation of services, and whose listing states that either
the equipment, material, or service meets appropriate designated standards or has been
tested and found suitable for a specified purpose. Shall -(correct answer)Indicates a
mandatory requirement. Accessible -(correct answer)Having access to but which first requires
the removal of a panel, door, or similar covering of the item described. Readily Accessible
-(correct answer)Having direct access without the need of removing or moving any panel, door,
or similar covering of the item described. Air -(correct answer)Circulating, Dilution, Excess,
Primary Circulating Air -(correct answer)Air for cooling, heating, or ventilation distributed to
habitable spaces Dilution Air -(correct answer)Air that enters a draft hood or draft regulator and
mixes with the flue gases. Excess Air -(correct answer)Air that passes through the combustion
chamber and the appliance flues in excess of that which is theoretically required for complete
combustion Primary Air -(correct answer)The air introduced into a burner that mixes with the
gas before it reaches the port or ports Air Conditioning -(correct answer)The treatment of air so
