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A dropped ceiling is a secondary ceiling, hung below the main (structural) ceiling. It may also be referred to as a drop ceiling, T-bar ceiling, false ceiling, suspended ceiling, grid ceiling, drop in ceiling, drop out ceiling, or ceiling tiles and is a staple of modern construction and architecture in both residential and commercial applications.
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. Today, most tin ceiling manufacturers actually use recycled blackplate steel in a thickness of only 0.010 inches (0.25 mm). There are some manufacturers who also use actual tin plated steel ...
The southern end of the room, facing the lobby and arched entranceway, held a 26-foot-long issuing counter. The counter was screened at each end with copper grill panels, connected beneath a metal arch studded with electric globe lights. Originally, the hall ceiling was arched high against the roof, altered during the remodel into the library.
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Space between the structural ceiling and the dropped ceiling or under a raised floor is typically considered plenum; however, some drop-ceiling designs create a tight seal that does not allow for airflow and therefore may not be considered a plenum air-handling space. [1] [2]
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