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2. Insulated glazing - Wikipedia

   en.wikipedia.org/wiki/Insulated_glazing

   Fitting a second pane of glass to improve insulation began in Scotland, Germany, and Switzerland in the 1870s. [3] Insulating glass is an evolution from older technologies known as double-hung windows and storm windows. Traditional double-hung windows used a single pane of glass to separate the interior and exterior spaces.

3. Glazing (window) - Wikipedia

   en.wikipedia.org/wiki/Glazing_(window)

   The ideal gap size varies by location, but on average it ranges from 15-18 mm thick, giving a final assembly size of 23-26 mm assuming a typical glazing thickness of 4 mm. [9] A double-paned window with air in the gap has an R-value of 2.1, which is much better than the 0.9 that a single pane of glass yields. A triple-paned window, which is not ...

4. Window - Wikipedia

   en.wikipedia.org/wiki/Window

   The panes of glass are separated, creating an insulating air pocket that inhibits heat transfer much better than single pane windows. Double-paned windows have two parallel panes (slabs of glass) with a separation of typically about 1 cm; this space is permanently sealed and filled at the time of manufacture with dry air or other dry ...

5. Quadruple glazing - Wikipedia

   en.wikipedia.org/wiki/Quadruple_glazing

   Quadruple glazing (quadruple-pane insulating glazing) is a type of insulated glazing comprising four glass panes, commonly equipped with low emissivity coating and insulating gases in the cavities between the glass panes. Quadruple glazing is a subset of multipane (multilayer) glazing systems.

6. Window insulation - Wikipedia

   en.wikipedia.org/wiki/Window_insulation

   Clear double glazing has a U-factor between 1.8 and 3 W/(m 2 ⋅K) or between 0.3 and 0.5 Btu/(h⋅ft 2 ⋅°F) (about R-2) Clear triple glazing has a U-factor between 0.5 and 1 W/(m 2 ⋅K) or between 0.1 and 0.2 Btu/(h⋅ft 2 ⋅°F) (about R-3). Double and triple glazing are critical for energy efficiency. Single glass windows are no longer ...

7. Storm window - Wikipedia

   en.wikipedia.org/wiki/Storm_window

   Two-Track: Featuring an outer track with a screen on the lower half and a pane of glass on the upper half, and an inside track with a half-pane of glass for ventilation. Triple-Track: Consisting of two window panes and a half-screen on three separate tracks, allowing for adjustable ventilation.