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G -FACTOR (THERMAL CONDUCTANCE). The <br />coefficient of heat transmission (surface to surface) <br />through a building component or assembly, equal to <br />the time rate of heat flow per unit area and the unit <br />temperature difference between the warm side and <br />cold side surfaces (Btu/h ft2 x °F) [W/(m2 x K)j. <br />CIRCULATING: HOT WATER SYSTEM. A specifically <br />designed water distribution system where one or more <br />pumps are operated in the service hot water piping to <br />circulate heated water from the water -heating <br />equipment to the fixture supply and back to the <br />water -heating equipment. <br />CLIMATE ZONE. A geographical region based on <br />climatic criteria as specified in this code. <br />CODE OFFICIAL. The officer or other designated <br />authority charged with the administration and <br />enforcement oftbis code, or a duly authorized <br />representative. <br />COMMERCIAL BUILDING. For this code, all buildings <br />that are not included in the definition of "Residential <br />buildings," <br />CONDITIONED FLOOR AREA. The horizontal <br />projection of the floors associated with the <br />conditioned space. . <br />CONDTnoNED SPACE An area, room or space that is <br />enclosed within the building thermal envelope and <br />that is directly or indirectly heated or cooled. Spaces <br />are indirectly heated or cooled where they <br />communicate through openings with conditioned <br />spaced, where they are separated from conditioned <br />spaces by uninsulated walls, floors or ceilings, or <br />where they contain uninsulated ducts, piping or other <br />sources of heating or cooling. <br />CONTINUOUS Alit BARRIER, A combination of <br />materials and assemblies that restrict or prevent the <br />passage of air through. the building thermal envelope. <br />CONTINUOUS INSULATION (ai;). Insulating material <br />that is continuous across all structural members <br />without thermal bridges other than fasteners and <br />service openings. It is installed on the interior or <br />exterior or is integral to any opaque surface of the <br />building envelope. <br />CURTAIN WALL. Fenestration products used to create <br />an external nonload-bearing wall that is designed to <br />separate the exterior and interior environments. <br />DEMAND RECIRCULATION WATER SYSTEM. A water <br />distribution system where pump(s) prime the service <br />hot water piping with heated water upon demand for <br />hot water. <br />DUCT. A tube or conduit utilized for conveying air. <br />The air passages of self-contained systems are not to <br />be construed as air ducts. <br />DUCT SYSTENL A continuous passageway for the <br />transmission of air that, in addition to ducts, includes <br />duct fittings, dampers, .plenums, fans and accessory <br />air -handling equipment and appliances. <br />DWELLING UNIT. A single unit providing complete <br />independent living facilities for one or more persons, <br />including permanent provisions fnr living, sleeping, <br />eating, cooking and sanitation. <br />ENERGY ANALYSIS. A method for estimating the <br />annual energy use of the proposed design and <br />standard reference design based on estimates of <br />energy use. <br />ENERGY COST. The total estimated annual cost for <br />purchased energy for the building functions regulated <br />by this code, including applicable demand charges. <br />ENERGY SIMULATION TOOL. An approved software <br />program or calculation -based methodology that <br />projects the annual energy use of a building. <br />EXTERIOR WALL. Walls including both above -grade f <br />walls and below -grade ual.ls. <br />FENESTRATION. Products classified as either vertical <br />fenestration or skylights. <br />VERTICAL FENESTRATION. Windows (fixed or <br />moveable), glazed doors, glazed block and <br />combination opaque/glazed doors composed of <br />glass or other transparent or translucent glazing <br />materials and installed at a slope of at least 60 <br />degrees from horizontal. Opaque areas such as <br />spandrel panels are not considered vertical <br />fenestration. <br />k <br />SKYLIGHT. Glass or other transparent or translucent <br />glazing material installed at a slope of less than 60 <br />degrees from horizontal. <br />FENESTRATION AREA. Total area of the fenestration <br />measured using the rough opening, and including the <br />glazing, sash and frame. <br />FENESTRATION PRODUCT, FIELD -FABRICATED. A <br />fenestration product whose frame is made at the <br />construction site of standard dimensional lumber or <br />other materials that were not previously cut, or <br />otherwise formed with the specific intention of being <br />used to fabricate a fenestration product or exterior <br />door. Field fabricated does not include site -built <br />fenestration. <br />FENESTRATION PRODUCT, SITF�BIM T. A fenestration <br />designed to be made up of field -glazed or <br />field -assembled units using specific factory cut or <br />otherwise factory -formed framing and glazing units. <br />Examples ofsite-built fenestration include storefront <br />systems, curtain walls, and atrium roof systems. <br />RE -8 2015 Washington State Energy Code <br />