Gas code definitions Exam Questions
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Accessory - Answers - ✔✔a part capable of performing an independent function and
contributing to the operation of the appliance that it serves
Air supply - Answers - ✔✔(with respect to the installation of an appliance)- combustion
air, excess air, flue gas dilution air, primary air, secondary air, and ventilation air.
Combustion air - Answers - ✔✔the air required for satisfactory combustion of gas,
including excess air.
Excess air - Answers - ✔✔that portion of the combustion air that is supplied for the
initial stages or the combustion process and is supplied ustream from the point ot
ignition
Flue gas dilution air - Answers - ✔✔the ambient air that is admitted to a venting system
at the draft hood, draft diverter, or draft regulator.
Primary air - Answers - ✔✔thatportion of the combustion air that is supplied for the initial
stages of the combustion process and is supplied downstream from the point of ignition
Secondary air - Answers - ✔✔that portion of the combustion air that is supplied for the
intermediate and final stages of the combustion process and is supplied downstream
from the point of ignition.
Ventilation air - Answers - ✔✔air that is admitted to a space containing an appliance to
replace air exhausted through a ventilation opening or by means of exfiltration.
Appliance - Answers - ✔✔a device to convert gas into energy; the term includes any
component, control, wiring, piping, or tubing required to be part of the device.
Category 1 appliance - Answers - ✔✔an appliance that operates with a nonpositive vent
static pressure and with a flue loss not less than 17%
Category 2 appliance - Answers - ✔✔an appliance that operates with a nonpositive vent
static pressure and with a flue loss less than 17%
Category 3 appliance - Answers - ✔✔an appliance that operates with a positive vent
static pressure and with a flue loss not less than 17%
,Category 4 appliance - Answers - ✔✔an appliance that operates with a positive vent
static pressure and with a flue loss less than 17%
Approved - Answers - ✔✔acceptable to the authority having jurisdiction
Authority having jurisdiction - Answers - ✔✔the governmental body responsible for the
enforcement of any part of this Code, or the official or agency designated by that body
to exercise such a function.
Automatic vent damper device - Answers - ✔✔a device intended for installation at the
outlet or downstream of an individual appliance draft hood and designed to
automatically open the venting system before or shortly after the main burner is
activated and to automatically close the venting system after the main burner is
deactivated.
Electrically operated vent damper device - Answers - ✔✔an automatic vent damper
device that is controlled by electrical energy.
Thermally actuated vent damper device - Answers - ✔✔an automatic vent damper
device dependent for operation exclusively upon the direct conversion of the thermal
energy of the vent gases into mechanical energy.
Baffle - Answers - ✔✔a stationary device used to divert the flow of fluid (air, water, or
steam) and flue gasses (in the case of a flue baffle) of heat ( in the case of a heat
baffle).
Bathroom - Answers - ✔✔a room used primarily for bathing and containing a bathtub
and/or shower.
Bedroom - Answers - ✔✔a room furnished with a bed and used primarily for sleeping.
Bed-sitting room - Answers - ✔✔a one-room apartment serving as both a bedroom and
a sitting room.
Bleed vent - Answers - ✔✔a vent where the expiration or inspiration of air or gas occurs
from or to one side of a diphragm of any accessory, component, or equipment such as a
valve, pressure regulator, or switch.
Boiler - Answers - ✔✔an appliance intended to supply hot liquid or vapour for space-
heating, processing, or power purposes.
Branch line - Answers - ✔✔the part of a piping or tubing system that conveys gas from
the main piping or tubing or header to an
appliance(s).
, Building - Answers - ✔✔a structure or part thereof used or intended for supporting or
sheltering persons, animals, or property and classified by its occupancy in accordance
with the applicable building code of the authority having jurisdiction or, in the absence of
such, in accordance with the National Building Code of Canada.
Aircraft hanger - Answers - ✔✔a building or part thereof used by a gathering of persons
for civic, political, travel, religious, social, educational, recreational, or like purposes, or
for the consumption of food or drink.
Care or detention occupancy building. - Answers - ✔✔any building or part thereof used
or occupied by persons who require special care or treatment because of cognitive or
physical limitations, or by persons who are incapable of self-preservation and who are
restrained from self-destruction by security measures not under their control.
Commercial building - Answers - ✔✔any building used in connection with direct trade
with, or service of, the public.
Industrial building - Answers - ✔✔any building used in connection with production or
process work or with storage or warehousing.
Residential building - Answers - ✔✔any building or part thereof used by persons for
whom sleeping accommodation is provided but who are not harboured or detained to
receive medical care or treatment or are not involuntarily detained.
Building opening - Answers - ✔✔a planned aperture that is intended to permit air
infiltration by does not include an exhaust vent or a non-openable window
Burner - Answers - ✔✔a device or group of devices that forms an integral unit for the
introduction of gas, with or without air or oxygen, into the combustion zone for ignition.
Fan-assisted burner - Answers - ✔✔a burner in which the combustion air is supplied by
a mechanical device such as a fan or blower at sufficient pressure to overcome the
resistance of the burner only.
Forced-draft burner - Answers - ✔✔a burner that is not equipped with a mechanical
device for supplying combustion air.
Certified - Answers - ✔✔(with respect to any appliance, accessory, component,
equipment, or manufacturer's installation instructions)- investigated and identified by a
designated testing organization as conforming to recognized standards, requirements,
or accepted test reports.
Chimney - Answers - ✔✔a primarily vertical shaft that encloses at least one flue for
conducting flue gases outdoors.
With Answers 2025 New Update A+ Pass
Accessory - Answers - ✔✔a part capable of performing an independent function and
contributing to the operation of the appliance that it serves
Air supply - Answers - ✔✔(with respect to the installation of an appliance)- combustion
air, excess air, flue gas dilution air, primary air, secondary air, and ventilation air.
Combustion air - Answers - ✔✔the air required for satisfactory combustion of gas,
including excess air.
Excess air - Answers - ✔✔that portion of the combustion air that is supplied for the
initial stages or the combustion process and is supplied ustream from the point ot
ignition
Flue gas dilution air - Answers - ✔✔the ambient air that is admitted to a venting system
at the draft hood, draft diverter, or draft regulator.
Primary air - Answers - ✔✔thatportion of the combustion air that is supplied for the initial
stages of the combustion process and is supplied downstream from the point of ignition
Secondary air - Answers - ✔✔that portion of the combustion air that is supplied for the
intermediate and final stages of the combustion process and is supplied downstream
from the point of ignition.
Ventilation air - Answers - ✔✔air that is admitted to a space containing an appliance to
replace air exhausted through a ventilation opening or by means of exfiltration.
Appliance - Answers - ✔✔a device to convert gas into energy; the term includes any
component, control, wiring, piping, or tubing required to be part of the device.
Category 1 appliance - Answers - ✔✔an appliance that operates with a nonpositive vent
static pressure and with a flue loss not less than 17%
Category 2 appliance - Answers - ✔✔an appliance that operates with a nonpositive vent
static pressure and with a flue loss less than 17%
Category 3 appliance - Answers - ✔✔an appliance that operates with a positive vent
static pressure and with a flue loss not less than 17%
,Category 4 appliance - Answers - ✔✔an appliance that operates with a positive vent
static pressure and with a flue loss less than 17%
Approved - Answers - ✔✔acceptable to the authority having jurisdiction
Authority having jurisdiction - Answers - ✔✔the governmental body responsible for the
enforcement of any part of this Code, or the official or agency designated by that body
to exercise such a function.
Automatic vent damper device - Answers - ✔✔a device intended for installation at the
outlet or downstream of an individual appliance draft hood and designed to
automatically open the venting system before or shortly after the main burner is
activated and to automatically close the venting system after the main burner is
deactivated.
Electrically operated vent damper device - Answers - ✔✔an automatic vent damper
device that is controlled by electrical energy.
Thermally actuated vent damper device - Answers - ✔✔an automatic vent damper
device dependent for operation exclusively upon the direct conversion of the thermal
energy of the vent gases into mechanical energy.
Baffle - Answers - ✔✔a stationary device used to divert the flow of fluid (air, water, or
steam) and flue gasses (in the case of a flue baffle) of heat ( in the case of a heat
baffle).
Bathroom - Answers - ✔✔a room used primarily for bathing and containing a bathtub
and/or shower.
Bedroom - Answers - ✔✔a room furnished with a bed and used primarily for sleeping.
Bed-sitting room - Answers - ✔✔a one-room apartment serving as both a bedroom and
a sitting room.
Bleed vent - Answers - ✔✔a vent where the expiration or inspiration of air or gas occurs
from or to one side of a diphragm of any accessory, component, or equipment such as a
valve, pressure regulator, or switch.
Boiler - Answers - ✔✔an appliance intended to supply hot liquid or vapour for space-
heating, processing, or power purposes.
Branch line - Answers - ✔✔the part of a piping or tubing system that conveys gas from
the main piping or tubing or header to an
appliance(s).
, Building - Answers - ✔✔a structure or part thereof used or intended for supporting or
sheltering persons, animals, or property and classified by its occupancy in accordance
with the applicable building code of the authority having jurisdiction or, in the absence of
such, in accordance with the National Building Code of Canada.
Aircraft hanger - Answers - ✔✔a building or part thereof used by a gathering of persons
for civic, political, travel, religious, social, educational, recreational, or like purposes, or
for the consumption of food or drink.
Care or detention occupancy building. - Answers - ✔✔any building or part thereof used
or occupied by persons who require special care or treatment because of cognitive or
physical limitations, or by persons who are incapable of self-preservation and who are
restrained from self-destruction by security measures not under their control.
Commercial building - Answers - ✔✔any building used in connection with direct trade
with, or service of, the public.
Industrial building - Answers - ✔✔any building used in connection with production or
process work or with storage or warehousing.
Residential building - Answers - ✔✔any building or part thereof used by persons for
whom sleeping accommodation is provided but who are not harboured or detained to
receive medical care or treatment or are not involuntarily detained.
Building opening - Answers - ✔✔a planned aperture that is intended to permit air
infiltration by does not include an exhaust vent or a non-openable window
Burner - Answers - ✔✔a device or group of devices that forms an integral unit for the
introduction of gas, with or without air or oxygen, into the combustion zone for ignition.
Fan-assisted burner - Answers - ✔✔a burner in which the combustion air is supplied by
a mechanical device such as a fan or blower at sufficient pressure to overcome the
resistance of the burner only.
Forced-draft burner - Answers - ✔✔a burner that is not equipped with a mechanical
device for supplying combustion air.
Certified - Answers - ✔✔(with respect to any appliance, accessory, component,
equipment, or manufacturer's installation instructions)- investigated and identified by a
designated testing organization as conforming to recognized standards, requirements,
or accepted test reports.
Chimney - Answers - ✔✔a primarily vertical shaft that encloses at least one flue for
conducting flue gases outdoors.
