gas code definitions
Power venter
a field-installed device that provides mechanical draft and, when installed, is located between the appliance flue outlet or draft-control device and the vent or chimney termination, or at the vent or chimney termination.
Pilot
a flame that is used to ignite a gas/air or propane/air mixture at the main burner(s).
Hose connector
a flexible assembled conduit not exceeding 6 ft. (2 m) in length.
Hose
a flexible conduit
Air supply
(with respect to the installation of an appliance)- combustion air, excess air, flue gas dilution air, primary air, secondary air, and ventilation air.
Ventilation
(with respect to the space in which an appliance is installed) - the removal of inside air, leaked or spilled products of combustion, or flue gases from the space in which an appliance is installed to outside the space, and the replacement of same by air from outside the space.
Fan + Fan
The maximum combined input rating of two or more fan-assisted appliances attached to the common vent. See Annex C.
Fan Min
The minimum appliance input rating of a Category 1 appliance with a fan-assisted combustion system that could be attached to the vent. See Annex C.
Storage Garage
a building or part thereof that is used or intended for either the storage or parking of motor vehicles and that contains no provision for either the repair or servicing of such vehicles.
Aircraft hanger
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.
Repair Garage
a building or part thereof where facilities are provided for the repair or servicing of a motor vehicle.
Private Garage
a building, designed for the parking, storage, or repair of vehicles used to transport propane, that is approved by the authority having jurisdiction for its purpose and is located on property owned or leased by the owner of the vehicles.
Purge burner
a burner equipped with a constant ignition source and a flame arrestor, intended to burn the escaping (discharged) gas during purging operations.
Fan-assisted burner
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
a burner that is not equipped with a mechanical device for supplying combustion air.
Masonry or concrete chimney
a chimney of brick, stone, concrete, or approved masonry units constructed on site.
Factory-built chimney
a chimney that consists entirely of factory-made parts, each designed to be assembled with the other without requiring fabrication on site.
Cylinder (with respect to (NGV/propane storage)
a container designed and fabricated in accordance with the specifications of Transport Canada or the US Department of Transportation for the storage and transportation of gas.
Operating control
a control used to regulate or control the normal operationof an appliance.
Metal connector
a corrugated or semi-rigid conduit made entirely of metal.
Valve
a device by which the flow of a fluid can be started, stopped, or regulated by a movable part that opens or obstructs passage.
Relief device
a device designed to open to prevent a rise of gas pressure in excess of a specified value due to an emergency or abnormal conditions.
Fireplace
a device for burning solid fuel that has the major portion of one or more essentially vertical sides open or openable for refuelling and for the visual effects of the burning fuel.
Stop-fill valve
a device in a container that is intended to automatically shut off the flow of liquid into the container when a predetermined fixed level is achieved.
Heat reclaimer
a device installed either externally or internally to a venting system to extract heat from flue gases.
Automatic vent damper device
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.
Burner
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.
Overpressure protection device
a device that under abnormal conditions will act to reduce, restrict, or shut off the supply of gas flowing into a system to prevent gas pressure in that system from exceeding the rated pressure of the system components.
Appliance
a device to convert gas into energy; the term includes any component, control, wiring, piping, or tubing required to be part of the device.
Pressure regulator
a device, either adjustable or nonadjustable, for controlling and maintaining, wihtin acceptable limits, a uniform outlet pressure.
Equipment
a device, other than an appliance, acessory, or component, that is connected to a piping or tubing system.
Natural draft
a draft other than a mechanical draft.
Draft hood
a draft-control device having neither movable nor adjustable parts. A draft hood may be built into an appliance, attached to an appliance, or made part of a vent connector. It is designed to (a) ensure the ready escape of flue gases from the combustion chamber in the event of either no draft or stoppage downstream from the draft hood; (b) prevent a backdraft from entering the combustion chamber of the appliance; and (c) neutralize the effect of stack action of either a chimney or a vent upon the operation of the appliance.
Draft rregulator (barometric damper)
a draft-control device intended to stabilize the natural draft in an appliance by admitting room air to the venting system. A double-acting draft regulator is one whose balancing damper is free to move in either direction.
Mobile home
a dwelling that consists of a vehicular portable structure built on a chassis and designed to be used with or without a permanent foundation and to be connected to indicated utilities.
Insulating millboard
a factory-fabricated board formed with noncombustible materials, normally fibres, and having a thermal conductivity not exceeding
Manually operated flue damper
a flue damper that is adjustable and manually set and locked in the desired position, and is designed or constructed to provide a fixed minimum opening.
Construction heater
a portable direct-fired unvented heater intenced only for temporary use in heating buklding under construction, alteration, or repair.
Recreational vehicle
a portable structure intended as temporary accommodation for travel, vaction, or recreational use. Such a structure includes a chassis-mounted camper, motorized home, slide-in camper, tent trailer, or travel trailer.
Line pressure regulator
a pressure regulator intended for installation in a gas distribution eyetem between the utility service regulator or a first-stage regulator (propane) and gas utilization equipment.
Appliance regulator
a pressure regulator located in the valve train of an appliance.
Hydrostatic relief valve
a pressure relief valve installed in a liquid propane line.
Internal relief valve
a pressure relief valve that is built into the body of the diaphram assembly of a pressure regulator.
Service regulator
a pressure reulator installed on a service line to control the pressure of the gas delivered to the customer.
Chimney
a primarily vertical shaft that encloses at least one flue for conducting flue gases outdoors.
Combustion safety control (flame safeguard)
a primary safety control that senses the presence of flame and causes gas to be shut off in the event of flame or ignition failure.
Zero governor
a regulating device that is adjusted to deliver gas at atmospheric pressure within its flow rating.
Lock-up (positive shut-off) regulator
a regulator that is capable of maintaining a reduced outlet pressure when the fuel flow condition is static.
Line relief valve
a relief valve installed in the piping or tubing system downstream of a final-stage pressure regulator that is not equipped with an internal relief valve.
Bedroom
a room furnished with a bed and used primarily for sleeping.
Bathroom
a room used primarily for bathing and containing a bathtub and/or shower.
Safety limit control
a safety control intended to prevent an unsafe condition of temperature, pressure, or liquid level.
Enclosure
a secondary structure (room) within or attached to a structure (building) in which an appliance is installed.
Direct-fired make-up air heater (DFMAH)
a self contained direct-fired air heater used only to heat outside air to replace inside air that is exhasusted; it is not intended for building heating.
Multiple-section mobile home
a single structure composed of separate mobile units, each towable on its own chassis; when the units are towed to the site, they are coupled together mechanically and electrically to form the single structure. These structures are sometimes referred to as double-wide mobile homes when only two units are joined together.
Metal chimney (smokestack)
a single-wall chimney of metal constructed on site.
Interuppted ignition
a source of ignition that ceased to function after the trial-for-ignition period.
Intermittent ignition
a source of ignition that continues to function during the entire period that the flame is present.
Confined space
a space whose volume is less that 50 ft³/1,000 Btuh (4.8 m³/kW) of the aggregate input rating of all appliances installed in that space.
Baffle
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).
Building
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.
Vent
that portion of a venting system designed to convey flue gases directly to the outdoors from either a vent connector or an appliance when a vent connector is not used.
Flue collar
that portion of an appliance designed for the attachment of a draft hood, vent connector, or venting system.
Excess air
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
Secondary air
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.
Primary air
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
Gallon
the Canadian standard gallon as defined under the Canadian Weights and Measures act.
Cumbustion air
the air required for satisfactory combustion of gas, including excess air.
Flue gas dilution air
the ambient air that is admitted to a venting system at the draft hood, draft diverter, or draft regulator.
Chimney Draft
the available natural draft or the chimney measured at or near the base or the chimney.
Tank(with respect to NGV/propane storage)
the class of container for the storage and transportation of gas, designed and fabricated in accordance with CSA B51.
Valve train
the combination of valves, controls, and piping and tubing of an appliance upstream from the manifold through which gas is supplied to the appliance and by which gas is controlled.
Point of Transfer
the dispensing hose inlet connection.
Mechanical draft
the draft produced by a mechanical device, such as a fan, blower, or aspirator, that can supplement natural draft.
Structure
the entire building in which an appliance is installed.
Ignition
the establishment of a flame.
Draft
the flow of air or combustion products, or both, through an appliance and its venting system.
Authority having jurisdiction
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.
NAT Max
the maxi mum appliance input rating of a category 1 appliance equipped with a draft hood that could be attached to the vent. There are no minimum appliance input ratings for draft-hood-equipped appliances.
Certified
(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.
Package unit
an appliance supplied as a complete unit, including burner, controls and integral wiring.
Automatic flue damper
a flue damper that is designed to fully open the venting system automatically before ignition of the main burner and is either interlocked to automatically close off the supply of gas to the appliance or provided with means to ensure that the damper will fall fully open upon loss of the driving medium.
Floor furnace
a furnace that is suspended form the floor of the space being heated and that supplies warm air to such space through integral floor or wall grilles without the use of ducts.
Quick-disconnect device
a hand-operated device that is used for connecting and disconnecting either an appliance or an appliance connector to a gas supply and that is equipped with an automatic means to shut off the gas supply when the device disconnected.
Non-recirculating direct gas-fired industrial air heater (DFIAH)
a heater in which all the products of combustion generated by the gas-burning device are released into the airstream being heated and whose purpose is to offset building heat loss by heating only incoming outside air.
Catalytic heater
a heater that employs a porous matrix on or in which is distributed a catalytic agent such as platinum; the role of the matrix is to support the catalyst and to provide a surface on which the combustionof the hydrocarbon fuel vapour takes place.
Radiant heater
a heater that radiates heat to the surrounding air.
Infrared heater
a heater that transfers heat from the source to the heated objects without heating the intervening air.
Dwelling unit
a housekeeping unit used or intended to be used as a domicile by one or more persons, and usually containing cooking, eating, living, sleeping, and sanitary facilities.
Condensate (condensation)
a liquid separated from a gas (including flue gas) due to a reduction in temperature or an increase in pressure.
Flammable liquid
a liquid that has a flahpoint below 100⁹F (38⁹C) and that has a vapour pressure not exceeding 40 psia (276 kPa absolute) at 100⁹F (38⁹C).
Combustible liquid
a liquid that has a flashpoint at or above 100⁹F (38⁹C) and below 200⁹F (93⁹C)
Lubricated-plug-type valve
a manually operated valve of the plug and barrel type that is a) provided with means for maintaining a lubricant between its bearing surfaces; b) so designed that the lapped bearing surfaces can be lubricated and the lubricant level maintained without removing the valve from service; c) so constructed that the lubricant can be stored in a reservoir so as to be distributed evenly over the entire lapped bearing surfaces of the valve when the plug is rotated; and d) equipped with built-in stops to limit the rotation of the plug to one quarter turn when fully opening or fully closing the valve.
Test firing valve (firing valve)
a manually operated, lubricated-plug-type, quarter turn valve that has stops in the open and closed positions and has an attached handle or loose-fitting key or extended handle wrench, and that is located downstream of all safety shut-off valves on the valve train and as close to the burner as is practicable.
Mechanical air intake
a means to mechanically provide ventilation and/or combustion air requirements to a building.
Induced draft
a mechanical draft produced by a device downstream from the combustion zone of an appliance.
Forced draft
a mechanical draft produced by a device upstream from the combustion zone of an appliance.
Swing-out and expandable room-section mobile home
a mobile home that can be telescoped when towed and expanded later for additional capacity.
Wash-mobile
a mobile outdoor unit that uses propane-heated water, or a solution, for the purpose of cleaning.
flue damper
a movable plate for regulating the flow of fulue gases and inte4nded for installation either in the flue outlet of any gas appliance or in the vent connector from an individual appliance that is not equipped with a draft-control device.
Bed-sitting room
a one-room apartment serving as both a bedroom and a sitting room.
Accessory
a part capable of performing an independent function and contributing to the operation of the appliance that it serves
Proved pilot
a pilot flame supervised by a primary safety control that senses the presence of the pilot proir to gas being admitted to the main burner.
Expanding Pilot
a pilot that burns at low turndown throughout the entire time the burner is in service, whether or not the main burner is firing, except that upon a call for heat, the fuel flow to the pilot is automatically increased to produce a flame that will reliably igiite the main burner fuel.
Continuous Pilot
a pilot that burns without turndown throughout the entire time the burner is in service, whether the main burner is firing or not.
Intermittent pilot
a pilot that is automatically lighted each time there is a call for heat and that is cut off automatically at the end of the trial-for-ignition period fo the main burner.
Interrupted pilot
a pilot that is automatically lighted each time there is a call for heat and that is cut off automatically at the end of the trial-for-ignition period of the main burner.
Building opening
a planned aperture that is intended to permit air infiltration by does not include an exhaust vent or a non-openable window
Damper
a plate or valve for regulating the flow of air or flue gas.
Drip pocket (drip)
a pocket in a piping system designed for the colection of condensate and from which the condensate can be removed.
Dirt pocket (dust pocket)
a pocket in a piping system designed for the collection of dirt and from which the dirt can be removed.
Mobile Industrial or commercial structure
a structure that is not intended as a dwelling unit, is towable on tis own chassis, and is designed for use without a permanent foundation. Such a structure is built specifically for commercial or industrial use, such as a construction office, bunkhouse, wash house, kitchen and dining unit, library, television unit, industrial display unit, laboratory uit, or medical clinic.
Venting system
a system for the removal of flue gases to the outdoors by means of a chimney, vent connector, or a natural or mechanical exhaust system.
Mobile housing
a term that includes all of the following structures:
Mobile outdoor food service unit
a unit used outdoors for preparation and dispensing of food or berages and that contains appliances or equipment operated by propane in the vapour state. The unit can be equipped with wheels and its own motive power.
Internal valve
a valve designed and installed so that its seat is within a tank and the arrangement of the parts of the valve is such that damage to the parts outside the tank will not prevent effective seating the valve.
Excess-flow valve
a valve designed to close when the liquid or vapour passing through it exceeds a prescribed flow rate as determined by a pressure drop across the valve.
Cylinder valve
a valve fitted to a cylinder.
Safety shut-off valve
a valve that automatically shuts off the supply of gas when de-energized by a combustion safety control, safety limit control, or loss of actuating meduim.
Back check valve
a valve that is normally closed and allows flow in only one direction.
Emergency shut-off valve
a valve that is part of a system that is designed to limit and shut down the flow of propane in the event that a vehicle moves away from a transfer point with the transfer hose or swivel-type piping connected to it.
Direct-fired vaporizer
a vaporizer in which heat furnished by a flame is directly applied to a heat-exchange surface of the container.
Indirect vaporizer
a vaporizer in which heat furnished by steam, hot water, or another heating medium is applied to a vaporizing chamber's tubing, pipe coils, or other heat-exchange surface containing the liquid propane to be vaporized. the heating of the medium being used occurs at a point remote from the vaporizer.
Motorized home
a vehiclular portable structure of self-propelled design.
Tent Trailer
a vehicular portable structure built on its own chassis and having a rigid or canvas top and side walls that may be folded or otherwise condensed for transit.
Travel trailer
a vehicular portable structure intended to be towed by a motor vehicle and that does not fold up or reduce in size for transit.
Type BW
a vent complying with CAN/ULC - S605 and consisting entirely of factory-made parts, each designed to be assembled with the others without requiring field fabrication, and intended for venting only wall furnaces for use with this type of vent.
Type B vent
a vent complying with CAN/ULC-S36 and consisting entirely of factory-made parts, each designed to be assembled with the others without requiring field fabrication, and intended for venting gas appliances.
Type L
a vent complying with ULC S609 and consisting of factory-made parts, each designed to be assembled with the others without requiring field fabrication.
Type BH vent
a vent complying with ULC S636 and consisting entirely of factory-made parts, each designed to be assembled with the others without requiring field fabrication, and intended for venting gas appliances.
Bleed vent
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.
Special venting system
a venting system certified with the appliance and either supplied or specified by the appliance manufacturer.
Approved
acceptable to the authority having jurisdiction
Ventilation air
air that is admitted to a space containing an appliance to replace air exhausted through a ventilation opening or by means of exfiltration.
Chassis-mounted camper
an accommodation body that attaches onto a truck chassis and is not intended for removal.
Flexible metallic hose
an all-metallic flexible gas conduit.
Residential appliance
an appliance commonly used in, but not restricted to use in, a dwelling unit.
Direct-vent appliance
an appliance constructed so that all the combustion air is supplied directly from, and the products of combustion are vented directly to, the outdoors by independent enclosed passageways connected directly to the appliance.
Fan-assisted combustion system
an appliance equipped with an integral mechanical means to either draw or force prodducts of combustion through the combustion chamber and/or heat exchanger. See Annex C.
Vaporizer
an appliance for converting liquid propane to vapour by means other than atmospheric heat transfer through the surface of the container.
Direct-fired appliance
an appliance in which the combustion products or flue gases are intermixed with the medium being heated.
Indirect-fired appliance
an appliance in which the combustion products or flue gases are not mixed within the appliance with the medium that is being heated.
Boiler
an appliance intended to supply hot liquid or vapour for space-heating, processing, or power purposes.
Commercial and industrial-type appliance or equipment
an appliance or equipment other than a residential or recreational type.
Commercial cooking appliance
an appliance that complies with the applicable CSA Standard covering hotel and restaurant ranges and unit broilers, hotel and restaurant deep fat fryers, commercial baking and roasting ovens, counter appliances, kettles, steam cookers, or steam generators.
Category 2 appliance
an appliance that operates with a nonpositive vent static pressure and with a flue loss less than 17%
Category 1 appliance
an appliance that operates with a nonpositive vent static pressure and with a flue loss not less than 17%
Category 4 appliance
an appliance that operates with a positive vent static pressure and with a flue loss less than 17%
Category 3 appliance
an appliance that operates with a positive vent static pressure and with a flue loss not less than 17%
Cylinder system
an assembly that includes the cylinder base or bracket, cylinder, cylinder valve, manifold valve assembly, regulator, and relief valve, or any combination of these.
Fast-closing valve
an automatic valve that has a closing time of less than 5 s upon being de-energized.
Thermally actuated vent damper device
an automatic vent damper device dependent for operation exclusively upon the direct conversion of the thermal energy of the vent gases into mechanical energy.
Electrically operated vent damper device
an automatic vent damper device that is controlled by electrical energy.
Flue
an enclosed passageway for conveying flue gases.
Component
an essential part of an appliance or equipment.
Internal excess-flow valve
an excess-flow valve that remains functional within the tank when any portion of the valve external to the tank's perimeter is sheared off or otherwise damaged. An internalexcess-flow valve can be integral to another valve.
Furnace
an indirect-fired, flue-connected, space-heating appliance that uses warm air as the heating medium and usually has provision for the attachment of ducts.
Fitting
an item in a piping or tubing system that is used as a means of connection, such as an elbow, return bend, tee, union, bushing, coupling, or cross, but does not include such functioning items as a valve or pressure regulator.
Monitoring regulator
an overpressure protection device that functions as a second gas pressure regulator in series with the primary gas pressure regulator.
Overpressure relief device
an overpressure protection device that functions by completely shutting off the flow of gas into the downstream system.
Residential building
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.
Care or detention occupancy building.
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
any building used in connection with direct trade with, or service of, the public.
Industrial building
any building used in connection with production or process work or with storage or warehousing.
Installer
any individual, firm, corporation, or company that either directly or through a representative is engaged in the installation, replacement, repair, or servicing of gas piping, venting systems, appliances, components, accessories, or equipment, and whose representative is either experienced or trained, or both in such work and has complied with the requirements of the authority having jurisdiction.
Readily accessible
capable of being reached quickly for operation, renewal, servicing, or inspection, without requiring climbing over, or the removal of, an obstacle or the use of a portable ladder.
False ceiling space
ceiling space that is enclosed with tiles or panels that are removable without the use of a tool. A typical type is th T-bar-constructed suspended ceiling.
Flue gases
combustion products and excess air.
Combustion products
constituents that result from the combustion of gas with the oxygen of the air and include inert gases but exclude excess air.
Container (with respect NGV/propane storage)
either a cylinder or a tank.
Draft-control device
either a draft hood or a draft regulator.
Noncombustible
material that coforms to ULC CAN4-S114 requirements for noncombustiblity.
Combustible
material that fails to conform to ULC CAN4-S114 requirements for noncombustibility.
NGV
natural gas stored in a gaseous state to be used as engine fuel for a highway vehicle.
N/A
not applicable due to physical or geometric constraints.
NR
not recommended due to potential for condensate formation and/or pressurization of the venting system.
Concealed piping or tubing
piping or tubing that, when in place in a wall, floor, or ceiling of a finished building, is hidden from view and can only be exposed by use of a tool. The term does not apply to piping or tubing that passes directly through a wall or partition.
Flame sensing device
that component of a combustion safety control that senses flame.
Vent connector
that part of a venting system that donducts the flue gases from the flue collar of an appliance to a chimney or vent, and that amy include a draft-control device.
Depressurization
the maximum appliance input rating of a Category 1 appliance equipped with a draft hood that could be attached to the vent when the appliance is located in a structure that can experience sustained depressurization of up to 0.02 in w.c. (5 Pa), e.g., a tight structure with a mechanicallly ventilated structure. See Annex C.
Fan Max
the maximum appliance input rating of a Category 1 appliance with a fan-assisted combustion system that could be attached to the vent. See Annex C.
NAT + NAT
the maximum combined input rating of two or more draft-hood-equipped appliances attached to the common vent.
Fan + Nat
the maximum combined input rating of two or more fan-assisted appliances attached to the common vent. See Annex C.
Maximum operating pressure
the maximum pressure to which any component or prtion or the fuel system can be subjected.
Flashpoint
the minimum temperature at which a liquid within a container gives off vapour in sufficient concentration to form an ignitable mixture with air near the surface of the liquid.
Branch line
the part of a piping or tubing system that conveys gas from the main piping or tubing or header to an appliance(s).
Set pressure
the start-to-discharge pressure for which a relief valve is set and marked.
Heavy-duty fittings
those fittings referred to as 300 lb banded fittings.
Purge
to replace the existing fluid (gaseous or liquid) in piping, tubing, equipment, a container, or an appliance with a desired fluid.
Connector
tubing or hose with a fitting at each end for connecting an appliance or equipment with piping or tubing.
VRA
vehaicle refuelling appliance.