01181nas a2200133   4500008004100000245008100041210006900122260003200191520068400223100002500907700001800932700002200950856007500972       2008                        eng d00aHighly Insulating Glazing Systems using Non-Structural Center Glazing Layers0 aHighly Insulating Glazing Systems using NonStructural Center Gla  aSalt Lake City, UTc06/20083 a<p>Three layer insulating glass units with two low-e coatings and an effective gas fill are known to be highly insulating, with center-of-glass U-factors as low as 0.57 W/m<sup>2</sup>-K (0.10 Btu/h-ft<sup>2</sup>-°F). Such units have historically been built with center layers of glass or plastic which extend all the way through the spacer system.</p><p>This paper shows that triple glazing systems with non-structural center layers which do not create a hermetic seal at the edge have the potential to be as thermally efficient as standard designs, while potentially removing some of the production and product integration issues that have discouraged the use of triples.</p>1 aArasteh, Dariush, K.1 aGoudey, Howdy1 aKohler, Christian  uhttps://facades.lbl.gov/publications/highly-insulating-glazing-systems