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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. In the summer, a window screen would be installed on the exterior over the double-hung window to keep out animals and insects.
A double-hung window where the upper sash is smaller (shorter) than the lower is termed a cottage window. [citation needed] A single-hung window has two sashes, but normally the top sash is fixed and only the bottom sash slides. Triple- and quadruple-hung windows are used for tall openings, common in New England churches.
Safety and security window films are polyester or PET films that are applied to glass and glazing in order to hold them together if the glass is shattered (similar to laminated glass). The main difference between film and laminated glass is that these shatter safe films can be applied to the glass or glazing after manufacture or installation.
The 6.4 mm (1 ⁄ 4 in) and 7.9 mm (5 ⁄ 16 in) sizes are generally used for single hung windows, while the two larger sizes are used for double hung windows. As 9.5 mm ( 3 ⁄ 8 in) is not a common size, the 7.9 mm ( 5 ⁄ 16 in) thickness may be used instead and shimmed as needed.
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Barred window of Villa Capponi, in Florence. The term window security may refer to any of a range of measures used to avoid unauthorized access through windows, and prevent crimes such as burglary and home invasions. Window security is used in commercial and government buildings, as well as in residential settings.
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