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  2. Fluorescent-lamp formats - Wikipedia

    en.wikipedia.org/wiki/Fluorescent-lamp_formats

    Retrofit replacement for 4 ft T8 32 W T8 1.0, 25 4 28 F28T8 F32T8/28w Retrofit replacement for 4 ft T8 32 W T8 1.0, 25 4 30 F32T8/ES Retrofit replacement for 4 ft T8 32 W T8: 1.0, 25: 2: 17 F17T8: Ballast-swap replacement for 2 ft T12 20 W T8 1.0, 25 3 25 F25T8 Ballast-swap replacement for 3 ft T12 30 W T8: 1.0, 25: 4: 32 F32T8: Ballast-swap ...

  3. Precast concrete - Wikipedia

    en.wikipedia.org/wiki/Precast_concrete

    A precast concrete walled house under construction An example of low-quality precast concrete with exposed dowels, connectors, indications of cracks, and malformations, even during its installation, Barangay Lantic, Carmona, Cavite, Philippines Interior view of the walls, supports, and roof of a precast commercial shop in Williston, North Dakota, US.

  4. Prefabricated building - Wikipedia

    en.wikipedia.org/wiki/Prefabricated_building

    A prefabricated building, informally a prefab, is a building that is manufactured and constructed using prefabrication. It consists of factory-made components or units that are transported and assembled on-site to form the complete building.

  5. Troffer - Wikipedia

    en.wikipedia.org/wiki/Troffer

    A troffer is a rectangular light fixture that fits into a modular dropped ceiling grid (i.e. 2' by 2' or 2' by 4'). Troffer fixtures have typically been designed to accommodate standard fluorescent lamps (T12, T8, or T5), but are now often designed with integral LED sources. Troffers are typically recessed sitting above the ceiling grid, but ...

  6. Concrete slab - Wikipedia

    en.wikipedia.org/wiki/Concrete_slab

    A concrete slab is a common structural element of modern buildings, consisting of a flat, horizontal surface made of cast concrete. Steel- reinforced slabs, typically between 100 and 500 mm thick, are most often used to construct floors and ceilings, while thinner mud slabs may be used for exterior paving ( see below ).

  7. Compact fluorescent lamp - Wikipedia

    en.wikipedia.org/wiki/Compact_fluorescent_lamp

    Circular and U-shaped lamps were devised to reduce the length of fluorescent light fixtures. The first fluorescent light bulb and fixture were displayed to the general public at the 1939 New York World's Fair. The spiral CFL was invented in 1976 by Edward E. Hammer, an engineer with General Electric, [7] in response to the 1973 oil crisis. [8]

  8. Fluorescent lamp - Wikipedia

    en.wikipedia.org/wiki/Fluorescent_lamp

    Fluorescent lamp tubes are often straight and range in length from about 100 millimeters (3.9 in) for miniature lamps, to 2.43 meters (8.0 ft) for high-output lamps. Some lamps have a circular tube, used for table lamps or other places where a more compact light source is desired.

  9. Large panel system building - Wikipedia

    en.wikipedia.org/wiki/Large_panel_system_building

    Most of these were torn down after 1975 and during the eighties to be replaced by 2–4 storey buildings constructed of prefabricated concrete slabs. To fit in with the medieval church and the almost complete city wall, the houses used rather small design units and decreased in height the farther away they were from the Church and the nearer ...

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