GLOSSARY OF WINDOW TERMS The Learning Center Double Pane Glazing Double pane glass has two panes of glass instead of one like a single pane window.  The space in between is maintained by a 'spacer'.  The space can be filled with a gas like Argon or Krypton to further increase insulation.  Double pane windows offer a good balance between cost and insulating performance. Double Hung Windows This style of vertical sliding window is composed of two panels, both of which move. Emissivity The relative ability of a surface to reflect or emit heat by radiation. Emissivity factors range from 0.00 to 1.00. The lower the emissivity, the less heat that is emitted through a window system. Emissivity is typically measured by U- factor (or its inverse, R-factor). ENERGY STAR® Windows Program A voluntary partnership between the U.S. Department of Energy (DOE) and the fenestration industry to promote sales of energy-efficient windows, doors and skylights. Double Pane Glazing - Grids Fenestration A window or skylight and its associated interior or exterior elements (e.g., shades or blinds). Gas Fill An insulating gas (such as argon or krypton) placed between window glazing panes to reduce the U-factor by suppressing conduction and convection. Glaze Glass or plastic panes, as in a window or skylight. Note that the terms "double-glazed" and "double-paned" are interchangeable. (The term "glazed" should not be confused with "coated" or "tinted".) Grids or Grilles Also called "muntins." The decorative bars that divide the glass part of a window up and create a pattern. With most newer windows, grids are located between the panes of glass. < previous main menu       next > 1-877-SWING CLEAN info@energyswingwindows.com 3245 Miracle Drive Murrysville, PA 15668 724-387-2991 PA Contractor ID PA001856