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2. Storm door - Wikipedia

   en.wikipedia.org/wiki/Storm_door

   Storm door, Japan. A storm door is a type of door that is installed in front of an exterior access door to protect it from bad weather and allow ventilation.Storm doors generally have interchangeable glass panels and window screen panels to provide visibility and prevent flying insects from entering the home.

3. Vision panel - Wikipedia

   en.wikipedia.org/wiki/Vision_panel

   A vision panel is a small window in a door which allows people to look through without opening the door. Vision panels are sometimes in walls, generally adjacent to a door. These have implications in safety, primarily to avoid opening doors on a person coming the other way, but also in case of fire to avoid opening a door onto a fire.

4. Door security - Wikipedia

   en.wikipedia.org/wiki/Door_security

   A metal doorframe with a strike plate built in: in other doors this would be a metal strikeplate in a wooden doorframe. The term door security or door security gate may refer to any of a range of measures used to strengthen doors against door breaching, ram-raiding and lock picking, and prevent crimes such as burglary and home invasions. Door ...

5. 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.

6. Storm window - Wikipedia

   en.wikipedia.org/wiki/Storm_window

   Storm windows come with either glass or acrylic panes. Glass panes provide better visibility and last longer, whereas acrylic panes are less breakable but can scratch more easily. Modern storm windows often feature low-e glass, which improves energy efficiency by reflecting heat. "Storm Windows". U.S. Department of Energy

7. Hurricane shutter - Wikipedia

   en.wikipedia.org/wiki/Hurricane_shutter

   [citation needed] Panels must be attached to the structure via screws in a direct mount or on tracks. When not in use, storm panels are stored in an easy to reach location. Newly constructed homes sometimes have an assigned area for storage of storm panels. A panel system hurricane shutter made out of aluminum or steel.