Access to exitmeans that part of a means of egress within a floor area that provides access to an exit serving the floor area.

Air-supported structuremeans a structure consisting of a pliable membrane that achieves and maintains its shape and support by internal air pressure.

Appliancemeans a device to convert fuel into energy and includes all components, controls, wiring and piping required to be part of the device by the applicable standard referred to in this Code.

Assembly occupancy(Group A) means the occupancy or the use of a building, or part thereof, by a gathering of persons for civic, political, travel, religious, social, educational, recreational or like purposes, or for the consumption of food or drink.

Atmospheric storage tankmeans a storage tank designed to operate at pressures from atmospheric to 3.5 kPa (gauge).

Authority having jurisdictionmeans 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.

Basementmeans a storey or storeys of a building located below the first storey.

Breechingmeans a flue pipe or chamber for receiving flue gases from one or more flue connections and for discharging these gases through a single flue connection.

Buildingmeans any structure used or intended for supporting or sheltering any use or occupancy.

Business and personal services occupancy(Group D) means the occupancy or use of a building or part thereof for the transaction of business or the rendering or receiving of professional or personal services.

Care or detention occupancy(Group B) means the occupancy or use of a building or part thereof by persons who require special care or treatment because of cognitive or physical limitations or by persons who are restrained from, or are incapable of, self-preservation because of security measures not under their control.

Chimneymeans a primarily vertical shaft enclosing at least one flue for conducting flue gases to the outdoors.

Class A firemeans a fire involving combustible materials such as wood, cloth and paper.

Class B firemeans a fire involving a flammable liquid or combustible liquid, fat or grease.

Class C firemeans a fire involving energized electrical equipment.

Class D firemeans a fire involving a combustible metal.

Closed containermeans a container sealed by means of a lid or other device such that neither liquid nor vapour will escape from it at ordinary temperatures.

Closuremeans a device or assembly for closing an opening through a fire separation or an exterior wall, such as a door, a shutter, wired glass or glass block, and includes all components such as hardware, closing devices, frames and anchors.

Combustible constructionmeans that type of construction that does not meet the requirements for noncombustible construction.

Combustible dustsmeans dusts and particles that are ignitable and liable to produce an explosion.

Combustible fibresmeans finely divided, combustible vegetable or animal fibres and thin sheets or flakes of such materials which, in a loose, unbaled condition, present a flash fire hazard, including cotton, wool, hemp, sisal, jute, kapok, paper and cloth.

Combustible liquidmeans a liquid having a flash point at or above 37.8°C and below 93.3°C. (See Subsection 4.1.2. of Division B.)

Dangerous goodsmeans those products or substances that are regulated by the “Transportation of Dangerous Goods Regulations.” (See Table 3.2.7.1. of Division B.)

Distilled beverage alcoholmeans a beverage that is produced by fermentation and contains more than 20% by volume of water-miscible alcohol.

Distillerymeans a process plant where distilled beverage alcohols are produced, concentrated or otherwise processed, and includes facilities on the same site where the concentrated products may be blended, mixed, stored or packaged.

Dwelling unitmeans a suite operated as 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.

Exitmeans that part of a means of egress, including doorways, that leads from the floor area it serves to a separate building, an open public thoroughfare, or an exterior open space protected from fire exposure from the building and having access to an open public thoroughfare. (See Appendix A.)

Fire compartmentmeans an enclosed space in a building that is separated from all other parts of the building by enclosing construction providing a fire separation having a required fire-resistance rating.

Fire dampermeans a closure consisting of a damper that is installed in an air distribution system or a wall or floor assembly and that is normally held open but designed to close automatically in the event of a fire in order to maintain the integrity of the fire separation.

Fire-protection ratingmeans the time in minutes or hours that a closure will withstand the passage of flame when exposed to fire under specified conditions of test and performance criteria, or as otherwise prescribed in the National Building Code of Canada 2005.

Fire-resistance ratingmeans the time in minutes or hours that a material or assembly of materials will withstand the passage of flame and the transmission of heat when exposed to fire under specified conditions of test and performance criteria, or as determined by extension or interpretation of information derived therefrom as prescribed in the National Building Code of Canada 2005. (See Appendix A.)

Fire separationmeans a construction assembly that acts as a barrier against the spread of fire. (See Appendix A.)

Fire stop flapmeans a device intended for use in horizontal assemblies required to have a fire-resistance rating and incorporating protective ceiling membranes that operates to close off a duct opening through the membrane in the event of a fire.

Firewallmeans a type of fire separation of noncombustible construction that subdivides a building or separates adjoining buildings to resist the spread of fire and that has a fire-resistance rating as prescribed in this Code and has structural stability to remain intact under fire conditions for the required fire-rated time.

First storeymeans the uppermost storey having its floor level not more than 2 m above grade.

Flame-spread ratingmeans an index or classification indicating the extent of spread-of-flame on the surface of a material or an assembly of materials as determined in a standard fire test as prescribed in the National Building Code of Canada 2005.

Flammable liquidmeans a liquid having a flash point below 37.8°C and having a vapour pressure not more than 275.8 kPa (absolute) at 37.8°C as determined by ASTM D 323, “Vapor Pressure of Petroleum Products (Reid Method).” (See Subsection 4.1.2. of Division B.)

Flash pointmeans 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. (See Subsection 4.1.3. of Division B.)

Floor areameans the space on any storey of a building between exterior walls and required firewalls, including the space occupied by interior walls and partitions, but not including exits, vertical service spaces, and their enclosing assemblies.

Fluemeans an enclosed passageway for conveying flue gases.

Flue collarmeans the portion of a fuel-fired appliance designed for the attachment of the flue pipe or breeching.

Flue pipemeans the pipe connecting the flue collar of an appliance to a chimney.

Fuel-dispensing stationmeans any premises or part thereof at which flammable liquids or combustible liquids are dispensed from fixed equipment into the fuel tanks of motor vehicles, watercraft or floatplanes.

High-hazard industrial occupancy(Group F, Division 1) means an industrial occupancy containing sufficient quantities of highly combustible and flammable or explosive materials which, because of their inherent characteristics, constitute a special fire hazard.

Individual storage areameans the area occupied by piles, bin boxes, racks or shelves, including subsidiary aisles providing access to the stored products, and separated from adjacent storage by aisles not less than 2.4 m in width. (See Appendix A.)

Industrial occupancy(Group F) means the occupancy or use of a building or part thereof for the assembling, fabricating, manufacturing, processing, repairing or storing of goods and materials.

Interconnected floor spacemeans superimposed floor areas or parts of floor areas in which floor assemblies that are required to be fire separations are penetrated by openings that are not provided with closures.

Low-hazard industrial occupancy(Group F, Division 3) means an industrial occupancy in which the combustible content is not more than 50 kg/m² or 1 200 MJ/m² of floor area.

Low pressure storage tankmeans a storage tank designed to operate at pressures greater than 3.5 kPa (gauge) and up to 100 kPa (gauge).

Lower explosive limitmeans the minimum concentration of vapour in air at which the propagation of flame occurs on contact with a source of ignition.

Major occupancymeans the principal occupancy for which a building or part thereof is used or intended to be used, and shall be deemed to include the subsidiary occupancies that are an integral part of the principal occupancy. The major occupancy classifications used in this Code are as follows:

A1	Assembly occupancies intended for the production and viewing of the performing arts
A2	Assembly occupancies not elsewhere classified in Group A
A3	Assembly occupancies of the arena type
A4	Assembly occupancies in which the occupants are gathered in the open air
B1	Care or detention occupancies in which persons are under restraint or are incapable of self-preservation because of security measures not under their control
B2	Care or detention occupancies in which persons having cognitive or physical limitations require special care or treatment
C	Residential occupancies
D	Business and personal services occupancies
E	Mercantile occupancies
F1	High-hazard industrial occupancies
F2	Medium-hazard industrial occupancies
F3	Low-hazard industrial occupancies

Marine fuel-dispensing stationmeans a fuel-dispensing station at which flammable liquids or combustible liquids are dispensed into the fuel tanks of watercraft or floatplanes.

Means of egressmeans a continuous path of travel provided for the escape of persons from any point in a building or contained open space to a separate building, an open public thoroughfare, or an exterior open space protected from fire exposure from the building and having access to an open public thoroughfare. Means of egress includes exits and access to exits.

Medium-hazard industrial occupancy(Group F, Division 2) means an industrial occupancy in which the combustible content is more than 50 kg/m² or  1 200 MJ/m² of floor area and not classified as a high-hazard industrial occupancy.

Mercantile occupancy(Group E) means the occupancy or use of a building or part thereof for the displaying or selling of retail goods, wares or merchandise.

Noncombustible constructionmeans that type of construction in which a degree of fire safety is attained by the use of noncombustible materials for structural members and other building assemblies.

Occupancymeans the use or intended use of a building or part thereof for the shelter or support of persons, animals or property.

Occupant loadmeans the number of persons for which a building or part thereof is designed.

Partitionmeans an interior wall 1 storey or part-storey in height that is not loadbearing.

Pressure vesselmeans a storage tank designed to operate at pressures greater than 100 kPa (gauge).

Process plantmeans an industrial occupancy where materials, including flammable liquids, combustible liquids or Class 2 gases, are produced or used in a process. (See Table 3.2.7.1. of Division B.)

Rackmeans any combination of vertical, horizontal or diagonal members that support stored materials on solid or open shelves, including both fixed and portable units.

Refinerymeans any process plant in which flammable liquids or combustible liquids are produced from crude petroleum, including areas on the same site where the resulting products are blended, packaged or stored on a commercial scale.

Residential occupancy(Group C) means the occupancy or use of a building or part thereof 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.

Self-service outletmeans a fuel-dispensing station other than a marine fuel-dispensing station where the public handles the dispenser.

Service roommeans a room provided in a building to contain equipment associated with building services. (See Appendix A.)

Service spacemeans space provided in a building to facilitate or conceal the installation of building service facilities such as chutes, ducts, pipes, shafts or wires.

Smoke alarmmeans a combined smoke detector and audible alarm device designed to sound an alarm within the room or suite in which it is located upon the detection of smoke within that room or suite.

Sprinklered(as applying to a building or part thereof) means that the building or part thereof is equipped with a system of automatic sprinklers.

Storage tankmeans a vessel for flammable liquids or combustible liquids having a capacity of more than 230 L, and designed to be installed in a fixed location.

Storeymeans that portion of a building situated between the top of any floor and the top of the floor next above it, and if there is no floor above it, that portion between the top of such floor and the ceiling above it.

Streetmeans any highway, road, boulevard, square or other improved thoroughfare 9 m or more in width, that has been dedicated or deeded for public use and is accessible to fire department vehicles and equipment.

Suitemeans a single room or series of rooms of complementary use, operated under a single tenancy, and includes dwelling units, individual guest rooms in motels, hotels, boarding houses, rooming houses and dormitories as well as individual stores and individual or complementary rooms for business and personal services occupancies. (See Appendix A.)

Supervisory staffmeans those occupants of a building who have some delegated responsibility for the fire safety of other occupants under the fire safety plan.

Tank vehiclemeans any vehicle, other than railroad tank cars and boats, with a cargo tank having a capacity of more than  450 L, mounted or built as an integral part of the vehicle and used for the transportation of flammable liquids or combustible liquids and including tank trucks, trailers and semi-trailers.

Unstable liquidmeans a liquid, including flammable liquids and combustible liquids, that is chemically reactive to the extent that it will vigorously react or decompose at or near normal temperature and pressure conditions or that is chemically unstable when subject to impact.

Vertical service spacemeans a shaft oriented essentially vertically that is provided in a building to facilitate the installation of building services including mechanical, electrical and plumbing installations and facilities such as elevators, refuse chutes and linen chutes.