Defined Terms
1) The words and terms in italics in this Code shall have the following meanings:
Addition means any conditioned space that is added to an existing building and that increases the building's floor surface area by more than 10 m 2 .
Air barrier assembly means the combination of air barrier materials and air barrier accessories within the environmental separator that are designed to act as a continuous barrier to the movement of air through the environmental separator.
Airflow control area means a portion of a building to which the flow of air from the heating, ventilating or air-conditioning air distribution system can be reduced or stopped without reducing or stopping the flow of air to other portions of the building.
Annual energy consumption means the annual sum of the lighting, service water heating and space-conditioning energy consumption of the proposed building design, as calculated in accordance with the requirements of Part 8 of Division B.
Assembly occupancyThe definition of this term is reproduced from the National Building Code of Canada 2010. 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.
Authority having jurisdiction means 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.
Boiler means an applianceThe definition of this term can be found in the National Building Code of Canada 2010. intended to supply hot water or steam for space or service water heating purposes, except storage-type service water heaters.
Building means any structure used or intended for supporting or sheltering any use or occupancy.
Building area means the greatest horizontal area of a building above grade within the outside surface of exterior walls or within the outside surface of exterior walls and the centre line of firewalls.
Building energy target means the annual energy consumption of a hypothetical replica of the proposed building, using the same energy sources for the same functions and having the same environmental requirements, occupancy, climatic data and operation schedules as the proposed building, but made to comply with all applicable prescriptive requirements of this Code.
Building envelope means the collection of components that separate conditioned space from unconditioned space, the exterior air or the ground, or that separate conditioned spaces intended to be conditioned to temperatures differing by more than 10°C at design conditions. (See Appendix A.)
Building height (in storeys) means the number of storeys contained between the roof and the floor of the first storey.
Ceiling height (CH) means the average height of the ceiling where there is a ceiling and the average height of the base of the installed luminaires where there is no ceiling.
Coefficient of performance (COP) means, for a heat pump in the heating mode, the ratio of the rate of net heat output to the total energy input expressed in consistent units and under designated rating conditions, as described in the standards referenced in this Code; for refrigerating equipment or a heat pump in the cooling mode, COP means the ratio of the rate of heat removal to the rate of energy input in consistent units and under designated rating conditions, as described in the standards referenced in this Code.
Combustion efficiency (E c) means a measure of the efficiency of fuel-burning equipment in converting fuel to heat, as obtained through the procedures described in the standards referenced in this Code.
Conditioned space means any space within a building, the temperature of which is controlled to limit variation in response to the exterior ambient temperature by the provision, either directly or indirectly, of heating or cooling over substantial portions of the year.
Dwelling unit means a suite operated as a housekeeping unit, used or intended to be used by one or more persons and usually containing cooking, eating, living, sleeping and sanitary facilities.
Enclosed space means a volume substantially surrounded by solid surfaces such as full-height walls or partitions, floors, ceilings, and openable devices such as doors and operable windows.
Energy-efficiency ratio (EER) means, for refrigerating equipment or a heat pump in the cooling mode, the ratio of net cooling capacity in Btu/h to the total rate of electric input in watts, under designated operating conditions, as described in the standards referenced in this Code.
Energy factor (EF) means a measure of overall energy efficiency in terms of energy output compared to energy consumption over a 24-h usage cycle and is obtained as described in the standards referenced in this Code.
Exhaust duct means a duct through which air is conveyed from an interior space to the outdoors or to unconditioned space.
Exit means 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.
Exterior entrance means a doorway used for entering, or for entering and exiting, a building, that leads from an exterior space to a space provided with interior lighting.
Exterior exit means a doorway used only for exiting from an area provided with interior lighting to an exterior space.
Exterior lighting means lighting other than interior lighting.
Facade lighting means lighting installed to highlight features of the principal front of a building or a face of a building that overlooks a street or open space and includes lighting installed on the facade and on constructed or natural surfaces in close proximity to the facade. Facade lighting does not include signage or other lighting installed on the facade that is intended to light exterior spaces or surfaces other than the facade.
Farm building means a building or part thereof that does not contain a residential occupancy and that is associated with and located on land devoted to the practice of farming, and used essentially for the housing of equipment or livestock, or the production, storage or processing of agricultural and horticultural produce or feeds.
Fenestration means all building envelope assemblies, including their frames, that transfer visible light, such as windows, clerestories, skylights, translucent wall panels, glass blocks, transoms, sidelights, sliding, overhead or swinging glass doors, and glazed inserts in doors, etc.
First storey means the uppermost storey having its floor level not more than 2 m above grade.
Floor surface area means the area of a floor surface, including heated garages, measured from the interior surface of the perimeter walls at or near floor level, including the area occupied by columns, interior walls and openings in the floor.
Foundation means a system or arrangement of foundation units through which the loads from a building are transferred to the supporting soil or rock.
Frame in a door, window or other glazed area means the associated head, jambs, sill and, where applicable, mullions which, when assembled, house the door, sash or fixed glazing.
Furnace means a space-heating appliance using warm air as the heating medium and usually having provision for the attachment of ducts.
General lighting means lighting that provides primary illumination throughout an interior area. General lighting shall not include decorative lighting or lighting that provides a dissimilar level of illumination within that area to serve a specialized application or feature.
Grade means the lowest of the average levels of finished ground adjoining each exterior wall of a building, except that localized depressions need not be considered in the determination of average levels of finished ground. (See First storey.)
Gross lighted area means the total area served by interior lighting, including the areas occupied by partitions but excluding areas occupied by exterior enclosing assemblies and by elevator and service shafts. (See Appendix A.)
Heat trap means an energy-conserving arrangement of the water piping entering or leaving a service water heater constructed to counteract the convective forces of the hot water (thermosyphoning) during standby periods.
Installed interior lighting power means the power, in watts, used by all the lighting systems that are part of the complete interior lighting design.
Integrated coefficient of performance (ICOP) means a single-number figure of merit expressing cooling part-load COP efficiency for commercial unitary air-conditioning and heat pump equipment that is based on weighted operation at various load capacities of the equipment (analogous to IEER).
Integrated energy-efficiency ratio (IEER) means a single-number figure of merit expressing cooling part-load energy efficiency for air-conditioning and heat pump equipment that is based on weighted operation at various load capacities of the equipment, as described in the standards referenced in this Code.
Integrated part-load value (IPLV) means a single-number figure of merit based on part-load energy-efficiency ratio or coefficient of performance expressing part-load efficiency for air-conditioning and heat pump equipment that is based on weighted operation at various load capacities of the equipment, as described in the standards referenced in this Code.
Interior lighting means
  1. lighting installed in spaces that are within the building envelope, and
  2. lighting installed in unconditioned or conditioned spaces that are sheltered from the outdoor environment and intended to light only those spaces, except for lighting at exterior entrances and exterior exits.
(See Appendix A.)
Interior lighting power allowance means the maximum lighting power allowed to be provided to illuminate the interior of a building.
Landscape lighting means lighting installed to highlight landscape elements, such as trees, shrubs, rocks and pools. Landscape lighting does not include lighting of exterior spaces or walkways.
Occupancy means the use or intended use of a building or part thereof for the shelter or support of persons, animals or property.
Occupant sensor means a device that detects the presence of people within an area and causes lighting, equipment or appliances to be regulated accordingly.
Opaque building assembly means a building assembly that is part of the building envelope, other than doors, and does not admit light.
Overall thermal transmittance (U-value) means the rate, in W/(m 2·K), at which heat is transferred through a building assembly that is subject to a temperature difference. It represents the amount of heat transferred through a unit area in a unit of time induced under steady-state conditions by a unit temperature difference between the environments on its two faces. The U-value reflects the capacity of all elements to transfer heat through the thickness of the assembly, as well as, for instance, through air films on both faces of above-ground components. Where heat is not transferred homogeneously across the area being considered, the overall thermal transmittance shall be determined. (See Appendix A.)
Partition means an interior wall one storey or part-storey in height that is not loadbearing.
Plenum means a chamber forming part of an air duct system.
Primary system means the combination of equipment working as a system that converts electricity or fuel to heating or cooling and may distribute it to one or more secondary systems (e.g. boilers and chillers), where such equipment is not already defined as part of the secondary system.
Repair garage means a building or part thereof where facilities are provided for the repair or servicing of motor vehicles.
Return duct means a duct for conveying air from a space being heated, ventilated or air-conditioned back to the heating, ventilating or air-conditioning appliance.
Sash means an assembly of secondary framing members that fits within the primary frame of a window and whose main purpose is to hold and support the glass in operable windows; however, a sash is often included in fixed windows to maintain a uniform appearance with operable windows.
Seasonal energy-efficiency ratio (SEER) means the total cooling, in Btu, provided by a central air conditioner or heat pump during its normal annual usage period for cooling, divided by its total electric power usage, in watt-hours, during that same period.
Secondary system means a system that provides air for the purposes of ventilating, heating and cooling a thermal block (e.g. fan system). Secondary systems may include dedicated equipment that converts electricity or fuel to heating or cooling. Secondary systems can be single-zone—serving only a single thermal block—or multiple-zone—serving one or more thermal blocks.
Service room means a room provided in a building to contain equipment associated with building services. (See Appendix A.)
Service water means water for plumbing systems, but not water for systems used exclusively for space-heating or -cooling, or for processes.
Sidelighting means the illumination of building interiors with daylight admitted through fenestration located on an exterior wall, such as windows.
Skylight means a form of fenestration that is inclined less than 60° from the horizontal.
Space heater means a space-heating appliance for heating the room or space within which it is located, without the use of ducts.
Standby losses (SL) are the heat losses incurred by a storage-type service water heater under a stable condition when no water is withdrawn from the tank and the water temperature is held constant by the thermostats.
Storage-type service water heater means a service water heater with an integral hot water storage tank.
Storey means that portion of a building that is 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.
Suite means 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.)
Supply air handler means that part of a heating, ventilating and air-conditioning system that conditions return air and/or outdoor air and delivers it to the supply ducts.
Supply duct means a duct for conveying air from a heating, ventilating or air-conditioning appliance to a space to be heated, ventilated or air-conditioned.
Temperature-control zone means a space that is controlled by an individual temperature-control device.
Theatre means a place of public assembly intended for the production and viewing of the performing arts or the screening and viewing of motion pictures, and consisting of an auditorium with permanently fixed seats intended solely for a viewing audience.
Thermal block means a space or group of spaces that is considered as one homogeneous space for modeling purposes. A thermal block shall be:
  1. one temperature-control zone,
  2. a group of temperature-control zones
    1. that are served by the same secondary system or by systems that can be considered to be identical,
    2. that are operated and controlled in the same way, and
    3. whose space use and envelope characteristics are sufficiently similar that the heating and cooling energy consumption obtained by modeling the group of zones as a thermal block is not significantly different from what would be obtained by summing the results for the individual zones modeled separately, or
  3. a zone consisting entirely of indirectly conditioned spaces.
Thermal efficiency (E t) means a measure of the efficiency of fuel-burning equipment in converting fuel to heat, as obtained through the procedures described in the standards referenced in this Code.
Toplighting means the illumination of building interiors with daylight admitted through fenestration located on the roof, such as skylights and rooftop monitors.
Unit heater means a suspended space heater with an integral air-circulating fan.