Editing Window (section)

=== 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>