Editing Window (section)

== Terms ==
EN 12519 is the European standard that describes windows terms officially used in EU Member States. The main terms are:

[[File:Casement (PSF).jpg|thumb|Casement window, with [[Latticework|latticed]] lights]]
* '''Light''', or '''Lite''', is the area between the outer parts of a window ([[Transom (architectural)|transom]], sill and jambs), usually filled with a glass pane. Multiple panes are divided by [[mullion]]s when load-bearing, [[muntin]]s when not.<ref>{{cite book |last=Brett |first=Peter |year=2004 |title=Carpentry and Joinery |edition=2, illustrated |publisher=Nelson Thornes |isbn=978-0-7487-8502-5 |page=[https://books.google.com/books?id=iVthU6rPGK8C&pg=PA225 255]}}</ref>
* '''Lattice light''' is a compound window pane madeup of small pieces of glass held together in a [[Latticework|lattice]].
* '''Fixed window''' is a unit of one non-moving lite. The terms ''single-light'', ''double-light'', etc., refer to the number of these glass panes in a window.
* '''Sash unit''' is a window consisting of at least one sliding glass component, typically composed of two lites (known as a ''double-light'').
* '''Replacement window''' in the United States means a framed window designed to slip inside the original window frame from the inside after the old sashes are removed. In Europe, it usually means a complete window including a replacement outer frame.
* '''New construction window''', in the US, means a window with a nailing fin that is inserted into a rough opening from the outside before applying siding and inside trim. A nailing fin is a projection on the outer frame of the window in the same plane as the [[glazing in architecture|glazing]], which overlaps the prepared opening, and can thus be 'nailed' into place. In the UK and mainland Europe, windows in new-build houses are usually fixed with long screws into expanding plastic plugs in the brickwork. A gap of up to 13&nbsp;mm is left around all four sides, and filled with expanding [[polyurethane foam]]. This makes the window fixing weatherproof but allows for expansion due to heat.
* '''[[Lintel]]''' is a beam over the top of a window, also known as a [[transom (architectural)|transom]].
* '''[[Window sill]]''' is the bottom piece in a window frame. Window sills slant outward to drain water away from the inside of the building.
* '''Secondary glazing''' is an additional frame applied to the inside of an existing frame, usually used on protected or listed buildings to achieve higher levels of thermal and sound insulation without compromising the look of the building
* '''[[Millwork (building material)|Decorative millwork]]''' is the moulding, cornices and lintels often decorating the surrounding edges of the window.

=== Labeling ===
The United States [[National Fenestration Rating Council|NFRC]] Window Label lists the following terms:
* [[Thermal conductivity|Thermal transmittance (U-factor)]], best values are around U-0.15 (equal to 0.8 W/m2/K)
* [[Solar heat gain coefficient]] (SHGC), ratio of solar heat (infrared) passing through the glass to incident solar heat
* [[Visible transmittance]] (VT), ratio of transmitted visible light divided by incident visible light
* [[airflow|Air leakage]] (AL), measured in cubic foot per minute per linear foot of crack between sash and frame
* [[Damp (structural)#Condensation|Condensation resistance]] (CR), measured between 1 and 100 (the higher the number, the higher the resistance of the formation of condensation)<ref>[http://www.nfrc.org/documents/WindowsandHeatLoss.pdf Windows and Heat Loss] {{Webarchive|url=https://web.archive.org/web/20100827012257/http://www.nfrc.org/documents/WindowsandHeatLoss.pdf |date=August 27, 2010 }}, [[NFRC]] Heat Loss Fact Sheet</ref>

The European harmonised standard hEN 14351–1, which deals with doors and windows, defines 23 characteristics (divided into ''essential'' and ''non essential''). Two other, preliminary European Norms that are under development deal with internal pedestrian doors (prEN 14351–2), smoke and fire resisting doors, and openable windows (prEN 16034).<ref>{{Cite web |url=http://www.alueurope.eu/wp-content/uploads/2012/12/CPR_guideline_Dec_2012_ver-1.pdf |title=CPR guideline |access-date=February 13, 2013 |archive-url=https://web.archive.org/web/20131106070925/http://www.alueurope.eu/wp-content/uploads/2012/12/CPR_guideline_Dec_2012_ver-1.pdf |archive-date=November 6, 2013 |url-status=dead }}</ref>