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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. Chicago Metallic Corporation - Wikipedia

   en.wikipedia.org/wiki/Chicago_Metallic_Corporation

   The company was noted by the Chicago Tribune as “one of the largest global manufacturers and suppliers of roll-formed ceiling grid, stamped metal decorative ceiling panels and related products”. [1] The company was owned by the Jahn family from 1938 to 2013. On August 19, 2013, the company was acquired by Rockwool International. The ...

4. 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 ...

5. Plenum space - Wikipedia

   en.wikipedia.org/wiki/Plenum_space

   In all such cases, discovery, and repair of such problems to eliminate unintended plenums is difficult due to the hidden nature, limited space, and difficult access of most installed drop ceilings. For highest fire safety, it is best to assume all drop-ceiling and raised-floor airspaces are plenums, whether or not they are officially designated ...

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7. Ceiling - Wikipedia

   en.wikipedia.org/wiki/Ceiling

   Alternatively, ceilings may be spray painted instead, leaving the pipework and ducts exposed but painted, and using spray foam. A subset of the dropped ceiling is the suspended ceiling, wherein a network of aluminum struts, as opposed to drywall, are attached to the joists, forming a series of rectangular spaces.