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  2. Dropped ceiling - Wikipedia

    en.wikipedia.org/wiki/Dropped_ceiling

    An older, less common type of dropped ceiling is the concealed grid system, which uses a method of interlocking panels into one another and the grid with the use of small strips of metal called 'splines', thus making it difficult to remove panels to gain access above the ceiling without damaging the installation or the panels. Normally, they ...

  3. Active fire protection - Wikipedia

    en.wikipedia.org/wiki/Active_fire_protection

    They are usually located at ceiling level and are connected to a reliable water source, most commonly municipal water supply. A typical automatic sprinkler system operates when heat at the site of a fire causes a fusible link or glass component in the sprinkler head to fail, thereby releasing the water from the sprinkler head. [ 5 ]

  4. Tin ceiling - Wikipedia

    en.wikipedia.org/wiki/Tin_ceiling

    There is also a patented interlocking tin panel that will screw directly into existing drywall/popcorn/plaster ceilings, without the need for extensive plywood installation. Tin panels today are made in 24-by-24-inch (610 mm × 610 mm) and 24-by-48-inch (610 mm × 1,220 mm) sizes for easier handling and one-person installation.

  5. Raised floor - Wikipedia

    en.wikipedia.org/wiki/Raised_floor

    An alternative raised floor application with disposable formworks from job site in Turkey A suction-cup tile lifter has been used to remove a tile.. A raised floor (also raised flooring, access floor(ing), or raised-access computer floor) provides an elevated structural floor above a solid substrate (often a concrete slab) to create a hidden void for the passage of mechanical and electrical ...

  6. Fire alarm control panel - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_control_panel

    Coded panels were the earliest type of central fire alarm control, and were made during the 1800s to the 1970s. A coded panel is similar in many ways to a modern conventional panel (described below), except each zone was connected to its own code wheel, which, depending on the way the panel was set up, would either do sets of four rounds of code until the initiating pull station was reset ...

  7. Coffer - Wikipedia

    en.wikipedia.org/wiki/Coffer

    Coffering on the ceiling of the Pantheon Coffered ceiling with carved human heads at Wawel Castle (). A coffer (or coffering) in architecture is a series of sunken panels in the shape of a square, rectangle, or octagon in a ceiling, soffit or vault. [1]

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