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2. Door - Wikipedia

   en.wikipedia.org/wiki/Door

   Steel doors are another major type of residential front doors; most of them come with a polyurethane or other type of foam insulation core – a critical factor in a building's overall comfort and efficiency. Steel doors mostly in default comes along with frame and lock system, which is a high cost efficiency factor compared to wooden doors.

3. Hollow structural section - Wikipedia

   en.wikipedia.org/wiki/Hollow_structural_section

   A hollow structural section (HSS) is a type of metal profile with a hollow cross section. The term is used predominantly in the United States, or other countries which follow US construction or engineering terminology. HSS members can be circular, square, or rectangular sections, although other shapes such as elliptical are also available.

4. Integrated framing assembly - Wikipedia

   en.wikipedia.org/wiki/Integrated_framing_assembly

   Engineers and construction industry professionals designed IFAs for large commercial projects in order to solve this door and window problem. As 14-gage galvanized hollow metal frames, IFAs are installed prior to the pouring of the concrete, are capable of being anchored into the footer, and function as the method of blocking out the opening ...

5. 50 Fascinating ‘Old-Time Photos’ That Show You Just How Much ...

   www.aol.com/80-photos-past-might-transport...

   Image credits: Old-time Photos To learn more about the fascinating world of photography from the past, we got in touch with Ed Padmore, founder of Vintage Photo Lab.Ed was kind enough to have a ...

6. Extrusion - Wikipedia

   en.wikipedia.org/wiki/Extrusion

   Extruded aluminium with several hollow cavities; T slots allow bars to be joined with special connectors. Extrusion is a process used to create objects of a fixed cross-sectional profile by pushing material through a die of the desired cross-section.

7. Honeycomb structure - Wikipedia

   en.wikipedia.org/wiki/Honeycomb_structure

   36 BC Marcus Varro reports most efficient use of space and building materials by hexagonal shape. 126 The Pantheon was rebuilt in Rome using a coffer structure, sunken panel in the shape of a square structure, to support its dome. 1638 Galileo Galilei discusses hollow solids and their increase of resistance without adding weight.