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Dropped ceiling. 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 ...
A plenum space is a part of a building that can facilitate air circulation for heating and air conditioning systems, by providing pathways for either heated/conditioned or return airflows, usually at greater than atmospheric pressure. Space between the structural ceiling and the dropped ceiling or under a raised floor is typically considered ...
The most common ceiling that contributes to fire-resistance ratings in commercial and residential construction is the dropped ceiling. In the case of a dropped ceiling, the rating is achieved by the entire system, which is both the structure above, from which the ceilings is suspended, which could be a concrete floor or a timber floor, as well ...
Several departments installed dropped ceilings anyway; the microbiology labs, which require strict dust control, were especially in need of them. [11]: 420 The partitions and dropped ceilings together interfered with the planned air circulation patterns in the towers, a problem that was not resolved until a renovation in the 1980s. [16]: 114
Plenum cable / ˈ p l ɛ n əm / is electrical cable that is laid in the plenum spaces of buildings. In the United States, plastics used in the construction of plenum cable are regulated under the National Fire Protection Association standard NFPA 90A: Standard for the Installation of Air Conditioning and Ventilating Systems.
The patent for the modern dropped ceiling, now universal in room construction, was issued to Donald A. Brown, who had applied for it on September 8, 1958. U.S. Patent No. 2,984,946 for "Accessible suspended ceiling construction" was granted to Brown who improved on the 1919 patent of Eric E. Hall's interlocking dropped ceiling tiles, with Donn ...