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2. Revolving door - Wikipedia

   en.wikipedia.org/wiki/Revolving_door

   Learn about the invention, construction and use of revolving doors, which are cylindrical enclosures with multiple doors that rotate around a vertical axis. Find out how they prevent drafts, allow large numbers of people to pass, and can be used for security or display purposes.

3. Door - Wikipedia

   en.wikipedia.org/wiki/Door

   Learn about the origins, evolution and features of doors, from ancient Egypt to modern times. Explore the different types, materials, designs and purposes of doors in various contexts and cultures.

4. Window - Wikipedia

   en.wikipedia.org/wiki/Window

   A window is an opening in a wall, door, roof, or vehicle that allows the exchange of light and may also allow the passage of sound and sometimes air. Learn about the etymology, history, types and technologies of windows from ancient to modern times.

5. Sliding glass door - Wikipedia

   en.wikipedia.org/wiki/Sliding_glass_door

   A sliding glass door. In architecture and construction, a sliding glass door (also patio door or doorwall [1] [2]) is a type of sliding door made predominantly from glass, that is situated in an external wall to provide egress and light.

6. Insulated glazing - Wikipedia

   en.wikipedia.org/wiki/Insulated_glazing

   Insulated glazing (IG) is a window with two or more glass panes separated by a space to reduce heat transfer. Learn how IG works, how it evolved from storm windows, and how it is made with different types of glass, gases, and spacers.

7. Storm door - Wikipedia

   en.wikipedia.org/wiki/Storm_door

   A storm door is a door installed in front of an exterior access door to protect it from bad weather and allow ventilation. Learn about the different types of storm doors (full-view, retractable screen, and ventilating), the materials they are made of (wood, aluminum, PVC, and fibreglass), and their advantages and disadvantages.