301.1 (3.1)General.

    Certain terms, abbreviations, and acronyms are defined in this chapter for the purposes of this code. These definitions are applicable to all chapters of this code.

    Terms that are not defined herein, but that are defined in standards that are referenced herein (Informative Note: e.g., ANSI/ASHRAE/IES Standard 90.1), shall have the meanings as defined in those standards.

    Other terms that are not defined shall have their ordinarily accepted meanings within the context in which they are used. Ordinarily accepted meanings shall be based on American standard English language usage, as documented in an unabridged dictionary accepted by the authority having jurisdiction.

    301.2 (3.2)Definitions.

    agricultural land: land that is, or was, within ten years prior to the date of the building permit application for the building project, primarily devoted to the commercial production of horticultural, viticultural, floricultural, dairy, apiary, vegetable, or animal products or of berries, grain, hay, straw, turf, seed, finfish in upland hatcheries, or livestock, and that has long-term commercial significance for agricultural production. Land that meets this definition is agricultural land regardless of how the land is zoned by the local government with zoning jurisdiction over that land.

    air, makeup: see ANSI/ASHRAE Standard 62.1.

    air, outdoor: see ANSI/ASHRAE Standard 62.1.

    air, transfer: see ANSI/ASHRAE Standard 62.1.

    airflow, minimum outdoor: the outdoor airflow provided by a ventilation system to meet requirements for indoor air quality, excluding any additional outdoor air intake to reduce or eliminate the need for mechanical cooling.

    alternative daily cover: cover material, other than earthen material, placed on the surface of the active face of a municipal solid-waste landfill at the end of each operating day to control vectors, fires, odors, blowing litter, and scavenging.

    annual sunlight exposure (ASE): the percent of an analysis area that exceeds a specified direct-sunlight illuminance level for more than a specified number of hours per year (Source: IES LM 83). Annual sunlight exposure is a metric that quantifies the potential for excessive sunlight in interior work environments.

    attic and other roofs: see ANSI/ASHRAE/IES Standard 90.1.

    authority having jurisdiction (AHJ): the agency or agent responsible for enforcing this code.

    baseline building design: see ANSI/ASHRAE/IES Standard 90.1.

    baseline building performance: see ANSI/ASHRAE/IES Standard 90.1.

    Basis of Design (BoD): a document that records the concepts, calculations, decisions, and product selections used to meet the owner’s project requirements and to satisfy applicable regulatory requirements, standards, and guidelines. The document includes both narrative descriptions and lists of individual items that support the design process. (See owner’s project requirements.)

    bilevel lighting control: lighting control in a space that provides at least one intermediate level of lighting power in addition to fully ON and fully OFF. Continuous dimming systems are covered by this definition.

    biobased product: a commercial or industrial product (other than food or feed) that comprises, in whole or in significant part, biological products or renewable agricultural materials (including plant, animal, and marine materials) or forestry materials.

    biodiverse plantings: nonhomogeneous, multiple-species plantings.

    breathing zone: see ANSI/ASHRAE Standard 62.1.

    brownfield: a site documented as contaminated by means of an ASTM E1903 Phase II Environmental Site Assessment or a site classified as a brownfield by a local, state, or federal government agency.

    building entrance: see ANSI/ASHRAE/IES Standard 90.1.

    building envelope: see ANSI/ASHRAE/IES Standard 90.1.

    building project: a building, or group of buildings, and site that utilize a single submittal for a construction permit or that are within the boundary of contiguous properties under single ownership or effective control. (See owner.)

    carbon dioxide equivalent (CO2e): a measure used to compare the impact of various greenhouse gases based on their global warming potential (GWP). CO2e approximates the time-integrated warming effect of a unit mass of a given greenhouse gas relative to that of carbon dioxide (CO2). GWP is an index for estimating the relative global warming contribution of atmospheric emissions of 1 kg of a particular greenhouse gas compared to emissions of 1 kg of CO2. The following GWP values are used based on a 100-year time horizon: 1 for CO2, 25 for methane (CH4), and 298 for nitrous oxide (N2O).

    classroom: a space primarily used for scheduled instructional activities.

    climate zone: see Normative Appendix A.

    combined energy efficiency ratio (CEER [I-P]) (CCOPC [SI]): the combined energy efficiency is a ratio of the total cooling in one year divided by the total energy from active, stand-by, and OFF modes as defined in AHAM Standard RAC-1; Btu/h/W (W/W).

    commissioning (Cx) plan: a document that outlines the organization, schedule, allocation of resources, and documentation requirements of the building commissioning process. [See commissioning (Cx) process.]

    commissioning (Cx) process: a quality-focused process for enhancing the delivery of a project. The process focuses on verifying and documenting that the facility and all of its systems and assemblies are planned, designed, installed, tested, operated, and maintained to meet the owner’s project requirements. (See owner’s project requirements.)

    commissioning (Cx) provider: an entity, identified by the owner and approved by the AHJ, who manages the commissioning team to implement the building commissioning process. [See commissioning (Cx) process.]

    Informative Note: This entity is sometimes known as a “commissioning authority,” “CxA,” or “approved agency.” [See commissioning (Cx) process.]

    conditioned space: see ANSI/ASHRAE/IES Standard 90.1.

    construction documents: see ANSI/ASHRAE/IES Standard 90.1.

    contaminant: see ANSI/ASHRAE Standard 62.1.

    continuous air barrier: see ANSI/ASHRAE/IES Standard 90.1.

    cycles of concentration: the ratio of makeup rate to the sum of the blowdown and drift rates.

    daylight area: area in an enclosed space that is in the primary sidelighted area, daylight area under roof monitors, or daylight area under skylights.

    daylight area under roof monitors: see ANSI/ASHRAE/IES Standard 90.1.

    daylight area under skylights: see ANSI/ASHRAE/IES Standard 90.1.

    daylight hours: the period from 30 minutes after sunrise to 30 minutes before sunset.

    demand control ventilation (DCV): see ANSI/ASHRAE/IES Standard 90.1.

    densely occupied space: those spaces with a design occupant density greater than or equal to 25 people per 1000 ft2 (100 m2).

    design professional: see ANSI/ASHRAE/IES Standard 90.1.

    designated park land: federal-, state-, or local-government owned land that is formally designated and set aside as park land or a wildlife preserve.

    dwelling unit: see ANSI/ASHRAE/IES Standard 90.1.

    dynamic glazing: see ANSI/ASHRAE/IES Standard 90.1.

    electronics: computers and accessories; monitors; printers; and other equipment, such as scanners, fax machines, electric typewriters, cell phones, telephones, answering machines, shredders, postage machines, televisions, VHS/DVD players, portable cassette/CD players with radio devices, and stereo equipment.

    emergency ride home: access to transportation home in the case of a personal emergency or unscheduled overtime for employees who commute via transit, carpool, or vanpool.

    enclosed space: see ANSI/ASHRAE/IES Standard 90.1.

    evapotranspiration (ET): the sum of evaporation from soil and plant surfaces and transpiration of water through leaf stomata.

    ETc: evapotranspiration of the plant material derived by multiplying ETo by the appropriate plant factor or coefficient.

    ETo: reference evapotranspiration for a cool-season grass as calculated by the standardized Penman-Monteith equation based on weather-station data.

    fenestration area: see ANSI/ASHRAE/IES Standard 90.1.

    fish and wildlife habitat conservation area: areas with which state or federally designated endangered, threatened, or sensitive species have a primary association.

    forest land: all designated state forests, national forests, and all land that is, or was, within ten years prior to the date of the building permit for the building project, primarily devoted to growing trees for long-term commercial timber production.

    functional and performance testing (FPT): testing performed to ensure that designated systems of the project meet the intended design performance requirements.

    functional and performance testing provider (FPT provider): an entity identified by the owner who manages the activities needed to implement the building functional and performance testing (FPT) activities.

    generally accepted engineering standard: see ANSI/ASHRAE/IES Standard 90.1.

    geothermal energy: heat extracted from the Earth’s interior that is used to produce electricity or mechanical power or to provide thermal energy for heating buildings or processes. Geothermal energy does not include systems such as heat pumps that use energy independent of the geothermal source to raise the temperature of the extracted heat.

    greenfield: a site of which 20% or less has been previously developed with impervious surfaces.

    greyfield: a site of which more than 20% is currently or has been previously developed with impervious surfaces.

    gross roof area: see ANSI/ASHRAE/IES Standard 90.1.

    gross wall area: see ANSI/ASHRAE/IES Standard 90.1.

    ground cover: plantings other than turfgrass that are lowgrowing and form dense vegetation over the soil area.

    hardscape: site paved areas, including roads, driveways, parking lots, walkways, courtyards, and plazas.

    heat island effect: the tendency of urban areas to be at a warmer temperature than surrounding rural areas.

    high-performance green building: a building designed, constructed, and capable of being operated in a manner that increases environmental performance and economic value over time, seeks to establish an indoor environment that supports the health of occupants, and enhances satisfaction and productivity of occupants through integration of environmentally preferable building materials and water-efficient and energy-efficient systems.

    high-speed door: a nonswinging door used primarily to facilitate vehicular access or material transportation, and having an automatic closing device with an opening rate of not less than 32 in./s (810 mm/s) and a closing rate of not less than 24 in./s (610 mm/s).

    hourly average sound pressure level (Leq): time-mean-square frequency-weighted sound pressure level for one hour

    hydrozone: an irrigated area of landscape in which the plants have similar water needs and are irrigated by the same type of emission devices.

    improved landscape: any disturbed area of the site where new plant and/or grass materials are to be used, including green roofs, plantings for stormwater controls, planting boxes, and similar vegetative use. Improved landscape shall not include hardscape areas such as sidewalks, driveways, other paved areas, and swimming pools or decking.

    institutional tuning: the process, by authorized personnel, of adjusting the maximum light output of individual luminaires, groups of luminaires, or entire lighting systems to support visual needs or to save energy. Institutional tuning is also known as “high-end trim control.”

    integrated design process: a design process using early collaboration among representatives of each stakeholder and participating consultant on the project. Unlike the conventional, or linear, design process, integrated design requires broad stakeholder/consultant participation.

    integrated project delivery: see integrated design process.

    interior projection factor (PF): see projection factor, interior.

    irrigation adequacy: a representation of how well irrigation meets the needs of the plant material. This reflects the percentage of required water for turf or plant material supplied by rainfall and controller-scheduled irrigations.

    irrigation excess: a representation of the amount of irrigation water applied beyond the needs of the plant material. This reflects the percentage of water applied in excess of 100% of required water.

    irrigation station: a set of irrigation emission devices supplied water by a single control valve. Also referred to as an “irrigation zone.”

    isolation devices: see ANSI/ASHRAE/IES Standard 90.1.

    landscape establishment period: a time period, beginning on the date of completion of permanent plantings and not exceeding 18 months, intended to allow the permanent landscape to become sufficiently established to remain viable.

    life-cycle assessment (LCA): a compilation and evaluation of the inputs, outputs, and potential environmental impacts of a building system throughout its life cycle. LCA addresses the environmental aspects and potential environmental impacts, (e.g., use of resources and environmental consequences of releases) throughout a building’s life cycle, from raw material acquisition through manufacturing, construction, use, operation, end-of-life treatment, recycling, and final disposal (end of life). The purpose is to identify opportunities to improve the environmental performance of buildings throughout their life cycles.

    lighting power allowance: see ANSI/ASHRAE/IES Standard 90.1.

    lighting quality: the degree to which the luminous environment in a space supports the requirements of the occupants.

    lighting zone (LZ): an area defining limitations for outdoor lighting.

    LZ0: undeveloped areas within national parks, state parks, forest land, rural areas, and other undeveloped areas as defined by the AHJ.

    LZ1: developed areas of national parks, state parks, forest land, and rural areas.

    LZ2: areas predominantly consisting of residential zoning, neighborhood business districts, light industrial with limited night time use, and residential mixed-use.

    LZ3: all areas not included in LZ0, LZ1, LZ2, or LZ4.

    LZ4: high-activity commercial districts in major metropolitan areas as designated by the local jurisdiction.

    liner system (Ls): an insulation system for a metal building roof that includes the following components. A continuous membrane is installed below the purlins and uninterrupted by framing members. Uncompressed, unfaced insulation rests on top of the membrane between the purlins. For multilayer installations, the last rated R-value of insulation is for unfaced insulation draped over purlins and then compressed when the metal roof panels are attached. A minimum R-3 (R- 0.5) thermal spacer block between the purlins and the metal roof panels is required unless compliance is shown by the overall assembly U-factor or otherwise noted.

    low-impact trail: erosion-stabilized pathway or track that uses natural groundcover or installed system greater than 50% pervious. The pathway or track is designed and used only for pedestrian and nonmotorized vehicles (excluding power-assisted conveyances for individuals with disabilities).

    maintenance plan: see maintenance program in ANSI/ASHRAE/ACCA Standard 180.

    maximum sound pressure level (Lmax): greatest frequencyweighted and exponential-time-weighted sound level within a stated time interval.

    mechanical cooling: see ANSI/ASHRAE/IES Standard 90.1.

    multilevel lighting control: lighting control in a space that provides at least two intermediate levels of lighting power in addition to fully ON and fully OFF. Continuous dimming systems are covered by this definition.

    networked guest-room control system: an energy management control system, accessible from the hotel/motel front desk or other central location, that is capable of identifying reserved rooms according to a timed schedule and is capable of controlling each hotel/motel guest room separately.

    nonresidential: see ANSI/ASHRAE/IES Standard 90.1.

    nonstandard part-load value (NPLV): see ANSI/ASHRAE/IES Standard 90.1.

    north-oriented: facing within 45 degrees of true north within the northern hemisphere (however, facing within 45 degrees of true south in the southern hemisphere).

    occupant load: the number of persons for which the means of egress of a building or portion thereof is designed.

    occupiable space: see ANSI/ASHRAE Standard 62.1.

    office furniture system: either a panel-based workstation comprising modular interconnecting panels, hang-on components, and drawer/filing components, or a freestanding grouping of furniture items and their components that have been designed to work in concert.

    once-through cooling: the use of water as a cooling medium, where the water is passed through a heat exchanger one time and is then discharged to the drainage system. This also includes the use of water to reduce the temperature of condensate or process water before discharging it to the drainage system.

    on-site renewable energy system: photovoltaic, solar thermal, geothermal energy, and wind systems used to generate energy and located on the building project.

    open-graded (uniform-sized) aggregate: materials such as crushed stone or decomposed granite that provide 30% to 40% void spaces.

    outdoor air fault condition: a situation in which the measured minimum outdoor airflow of a ventilation system is 10% or more below the set-point value that corresponds to the occupancy and operation conditions at the time of the measurement.

    owner: the party in responsible control of development, construction, or operation of a project at any given time.

    owner’s project requirements (OPR): a document that specifies the functional requirements of a project and the expectations of how it will be used and operated, including project goals, measurable performance criteria, cost considerations, benchmarks, success criteria, training requirements, documentation requirements, and supporting information.

    permanently installed: see ANSI/ASHRAE/IES Standard 90.1.

    permeable pavement: pervious concrete or porous asphalt that allows the movement of water and air through the paving material and which is primarily used as paving for roads, parking lots, and walkways. Permeable paving materials have an open-graded coarse aggregate with interconnected voids.

    permeable pavers: units that present a solid surface but allow natural drainage and migration of water into the base below by permitting water to drain through the spaces between the pavers.


    1. a.adapted plants: plants that reliably grow well in a given habitat with minimal attention from humans in the form of winter protection, pest protection, water irrigation, or fertilization once root systems are established in the soil. Adapted plants are considered to be low maintenance but not invasive.

    2. b.invasive plants: species of plants that are not native to the building project site and that cause or are likely to cause environmental harm. At a minimum, the list of invasive species for a building project site includes plants included in city, county, and regional lists and state and federal noxious weeds laws.

    3. c.native plants: plants that adapted to a given area during a defined time period and are not invasive. In America, the term often refers to plants growing in a region prior to the time of settlement by people of European descent.

    4. d.rainfall-ETc compatible plants: plants with documented ETc rates and having all of the following characteristics: (1) not native or invasive to the local geographic area of the site; (2) after the landscape establishment period, do not require supplemental annual irrigation, based on the ten-year average annual rainfall of the local climate and based on 80% of the plant’s ETc.

    porous pavers (open-grid pavers): units where at least 40% of the surface area consists of holes or openings that are filled with sand, gravel, other porous material, or vegetation.

    postconsumer recycled content: proportion of recycled material in a product generated by households or by commercial, industrial, and institutional facilities in their role as end-users of the product, which can no longer be used for its intended purpose. This includes returns of material from the distribution chain. (See recycled material.)

    preconsumer recycled content: proportion of recycled material in a product diverted from the waste stream during the manufacturing process. Content that shall not be considered preconsumer recycled includes the reutilization of materials such as rework, regrind, or scrap generated in a process and capable of being reclaimed within the same process that generated it. (See recycled material.)

    primary sidelighted area: see ANSI/ASHRAE/IES Standard 90.1.

    projection factor (PF): see ANSI/ASHRAE/IES Standard 90.1.

    projection factor (PF), interior: the ratio of the horizontal depth of the interior shading projection divided by the sum of the height of the fenestration above the interior shading projection and, if the interior projection is below the bottom of the fenestration, the vertical distance from the bottom of the fenestration to the top of the farthest point of the interior shading projection, in consistent units.

    proposed building performance: see ANSI/ASHRAE/IES Standard 90.1.

    proposed design: see ANSI/ASHRAE/IES Standard 90.1.

    public way: a street, alley, transit right of way, or other parcel of land open to the outdoors and leading to a street or transit right of way that has been deeded, dedicated, or otherwise permanently appropriated for public use and that has a clear width and height of not less than 10 ft (3 m).

    recovered material: material that would have otherwise been disposed of as waste or used for energy recovery (Informative Note: e.g., incinerated for power generation) but has instead been collected and recovered as a material input, in lieu of new primary material, for a recycling or a manufacturing process.

    recycled content: proportion by mass of recycled material in a product or packaging. Only preconsumer and postconsumer materials shall be considered as recycled content. (See recycled material.)

    recycled material: material that has been reprocessed from recovered (reclaimed) material by means of a manufacturing process and made into a final product or into a component for incorporation into a product. (See recovered material.)

    regulated energy use: see ANSI/ASHRAE/IES Standard 90.1.

    renewable energy certificate (REC): a tradable instrument that represents the environmental attributes of one megawatthour of renewable electricity generation and is transacted separately from the electricity generated by the renewable energy source.

    roof area, gross: see ANSI/ASHRAE/IES Standard 90.1.

    salvaged material: material, component, or assembly removed in a whole form from a structure or site in which it was permanently installed and subsequently reused in the building project.

    seating: task and guest chairs used with office furniture systems.

    secondary sidelighted area: see ANSI/ASHRAE/IES Standard 90.1.

    semiheated space: see ANSI/ASHRAE/IES Standard 90.1.

    service water heating: see ANSI/ASHRAE/IES Standard 90.1.

    sidelighting: daylighting provided by vertical fenestration mounted below the ceiling plane.

    sidelighting effective aperture: the relationship of daylight transmitted through vertical fenestration to the primary sidelighted areas. The sidelighting effective aperture is calculated according to the following formula:


    where Vertical fenestration VT is the visible transmittance of vertical fenestration as determined in accordance with NFRC 200. For products outside the scope of NFRC 200, VT is the solar photometric transmittance of the glazing materials as determined in accordance with ASTM E972.

    single-rafter roof: see ANSI/ASHRAE/IES Standard 90.1.

    site: a contiguous area of land that is under the ownership or control of one entity.

    skylight effective aperture: see ANSI/ASHRAE/IES Standard 90.1.

    smart controller (weather-based irrigation controller): a device that estimates or measures depletion of water from the soil moisture reservoir and operates an irrigation system to replenish water as needed while minimizing excess.

    soil-gas retarder system: a combination of measures that retard vapors in the soil from entering the occupied space.

    solar energy system: any device or combination of devices or elements that rely on direct sunlight as an energy source, including, but not limited to, any substance or device that collects sunlight for use in

    1. a.heating or cooling of a structure or building;

    2. b.heating or pumping of water;

    3. c.industrial, commercial, or agricultural processes; and

    4. d.generation of electricity.

    solar heat gain coefficient (SHGC): see ANSI/ASHRAE/IES Standard 90.1.

    solar reflectance index (SRI): a measure of a constructed surface’s ability to reflect solar heat, as shown by a small temperature rise. A standard black surface (reflectance 0.05, emittance 0.90) is 0, and a standard white surface (reflectance 0.80, emittance 0.90) is 100.

    spatial daylight autonomy (sDA): the percent of an analysis area that meets a minimum daylight illuminance level for a specified fraction of the hours per year (Source: IES LM 83). Spatial daylight autonomy is a metric quantifying annual sufficiency of ambient daylight levels in interior spaces.

    specular visible transmittance: the fraction of incident flux (lumens) that passes directly through a surface or medium without scattering.

    SWAT: smart water application technology as defined by the Irrigation Association.

    task lighting: see ANSI/ASHRAE/IES Standard 90.1.

    tubular daylighting device: a means to capture sunlight from a rooftop. Sunlight is then redirected down from a highly reflective shaft and diffused throughout interior space.

    turfgrass: grasses that are regularly mowed and, as a consequence, form a dense growth of leaf blades, shoots, and roots.

    unregulated energy use: see ANSI/ASHRAE/IES Standard 90.1.

    variable-air-volume (VAV) system: see ANSI/ASHRAE/IES Standard 90.1.

    vendor: a company that furnishes products to project contractors and/or subcontractors for on-site installation.

    verification: the process by which specific documents, components, equipment, assemblies, systems, and interfaces among systems are confirmed to comply with the criteria described in the owner’s project requirements. (See owner’s project requirements.)

    vertical fenestration: see ANSI/ASHRAE/IES Standard 90.1.

    view fenestration: fenestration that complies with all of the following:

    1. a.It provides building occupants with a view to the outdoors or to an interior daylit atrium.

    2. b.It has undiffused glazing with a haze value less than 3%, as determined in accordance with ASTM D1003.

    3. c.It has a center-of-glass visible transmittance (VT) of not less than 20%.

    4. d.The product of the center-of-glass VT and the openness factor of screens, patterned films, and ceramic frits is not less than 20%.

    5. e.Where dynamic glazing is provided, such glazing has a center-of-glass VT of not less than 20% at the highest end of its range.

    6. f.Where nonoperable opaque window treatments are provided, such as blinds, shades, and louvers, such treatments do not obstruct more than 40% of the fenestration glazing area.

    wall area, gross: see ANSI/ASHRAE/IES Standard 90.1.

    water, alternate on-site sources of: alternate on-site sources of water include, but are not limited to:

    1. a.rainwater or stormwater harvesting,

    2. b.air conditioner condensate,

    3. c.grey water from interior applications and treated as required,

    4. d.swimming-pool filter backwash water,

    5. e.cooling-tower blowdown water,

    6. f.foundation drain water,

    7. g.industrial process water, and

    8. h.on-site wastewater treatment plant effluent.

    water, nonpotable: water that is not potable water. (See water, potable.)

    water, potable: water from public drinking water systems or from natural freshwater sources, such as lakes, streams, and aquifers, where water from such natural sources would or could meet drinking water standards.

    water, reclaimed: nonpotable water derived from the treatment of waste water by a facility or system licensed or permitted to produce water meeting the jurisdiction’s water requirements for its intended uses, including, but not limited to, above-surface landscape irrigation.

    water-bottle filling station: a plumbing fixture or fixture fitting that is controlled by the user for the sole intended purpose of dispensing potable water into a personal drinking water bottle. Such fixtures and fittings are connected to the potable water distribution system of the premises and can be stand-alone fixtures or integrated with another fixture.

    water factor (WF):

    1. a.clothes washer (residential and commercial): the quantity of water in gallons (litres) used to wash each cubic foot (cubic metre) of machine capacity.

    2. b.residential dishwasher: the quantity of water use in gallons (litres) per full machine wash and rinse cycle.

    weatherproofing system: a group of components, including associated adhesives and primers, that when installed create a protective envelope against water and wind.

    wetlands: those areas that are inundated or saturated by surface or groundwater at a frequency and duration sufficient to support, and that under normal circumstances do support, a prevalence of vegetation adapted for life in saturated soil conditions. This definition incorporates all areas that would meet the definition of “wetlands” under applicable federal or state guidance—regardless of whether they are officially designated, delineated, or mapped—including man-made areas that are designed, constructed, or restored to include the ecological functions of natural wetlands.

    301.3 (3.3)Abbreviations and Acronyms

    ACalternating current
    AHJauthority having jurisdiction
    AHRIAir-Conditioning, Heating, and Refrigeration Institute
    ANSIAmerican National Standards Institute
    ASEannual sunlight exposure
    ASMEAmerican Society of Mechanical Engineers
    ASTMAmerican Society for Testing and Materials International
    BIFMAThe Business and Institutional Furniture Manufacturer’s Association
    BMSbuilding management system
    BoDBasis of Design
    BPFbuilding performance factor
    BtuBritish thermal unit
    Btu/hBritish thermal unit per hour
    BUGbacklight, uplight, and glare
    CACceiling attenuation class
    CCOPcombined coefficient of performance
    CDPHCalifornia Department of Public Health
    CEERcombined energy efficiency ratio
    cfmcubic feet per minute (ft3/min)
    c.i.continuous insulation
    CIECommission Internationale de L’Eclairage (International Commission on Illumination)
    CITESConvention on International Trade in Endangered Species of Wild Fauna and Flora
    CO2carbon dioxide
    CO2ecarbon dioxide equivalent
    CSACanadian Standards Association
    cSTCcomposite sound transmission class
    dbdry bulb
    dBAdecibel, A-weighting
    dBCdecibel, C-weighting
    DCdirect current
    DCVdemand control ventilation
    DRdemand response
    EISAEnergy Independence and Security Act
    EMSEnergy Management System
    EPActU.S. Energy Policy Act
    EPDenvironmental product declaration
    ESCerosion and sedimentation control
    ETomaximum evapotranspiration
    ETSenvironmental tobacco smoke
    FF&Efurniture, fixtures, and equipment
    FPTfunctional and performance testing
    gpmgallons per minute
    GWPglobal warming potential
    HIDhigh-intensity discharge
    HVACheating, ventilation, and air conditioning
    HVAC&Rheating, ventilation, air conditioning, and refrigeration
    IAIrrigation Association
    IAPMOInternational Association of Plumbing and Mechanical Officials
    IAQindoor air quality
    IECCInternational Energy Conservation Code
    IEQindoor environmental quality
    IESIlluminating Engineering Society
    IICimpact insulation class
    ISRimpact sound rating
    LCAlife-cycle assessment
    LCIlife-cycle inventory
    Leqhourly average sound pressure level
    Lmaxmaximum sound pressure level
    LPDlighting power density
    Lsliner system
    LZlighting zone
    MDFmedium density fiberboard
    MERVminimum efficiency reporting value
    mphmiles per hour
    M&Vmeasurement and verification
    N2Onitrous oxide
    NAnot applicable
    NAECANational Appliance Energy Conservation Act
    NICnoise isolation class
    NISRnormalized impact sound rating
    NNICnormalized noise isolation class
    NPLVnonstandard part-load value
    NRnot required
    OITCoutdoor-indoor transmission class
    O&Moperations and maintenance
    OPRowner’s project requirements
    PCIPerformance Cost Index
    PFprojection factor
    ppmparts per million
    RCRroom cavity ratio
    RECrenewable energy certificate
    SCAQMDSouth Coast Air Quality Management District
    sDAspatial daylight autonomy
    SHGCsolar heat gain coefficient
    SMACNASheet Metal and Air Conditioning Contractors National Association
    SRIsolar reflectance index
    STCsound transmission class
    SWATsmart water application technology
    T60reverberation time in seconds
    ULUnderwriters Laboratory
    USDAUnited States Department of Agriculture
    USEPAUnited States Environmental Protection Agency
    USFEMAUnited States Federal Emergency Management Agency
    USGBCUnited States Green Building Council
    VAVvariable air volume
    VOCvolatile organic compound
    VRFvariable refrigerant flow system
    VTvisible transmittance
    wbwet bulb
    WFwater factor