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Approved drop out (or drop-out) ceilings allow the installation of a dropped ceiling beneath existing fire sprinklers because the tiles, sometimes called melt-out ceiling tiles, are heat-sensitive and are designed to fall from the dropped ceiling suspension grid during a fire, allowing the sprinklers to spray their water.
For example, a popcorn ceiling is extremely friable, whereas asbestos floor tile is considered non-friable. [citation needed] Friable materials, such as popcorn ceiling tiles, have a lifespan between 20–40 years plus; whereas non-friable materials, such as asbestos roofing tiles, have a lifespan of 50–100 years and beyond.
Vertical section through a commercial building using HVAC plenum instead of airspace plenum. When both the supply and return ducts are constructed in this manner, it is possible to insulate the ducts and the dropped ceiling so that the upper airspace is not heated or cooled, increasing energy efficiency. This is a fully enclosed plenum.
A ceiling can also be the upper limit of a tunnel. The most common type of ceiling is the dropped ceiling, [citation needed] which is suspended from structural elements above. Panels of drywall are fastened either directly to the ceiling joists or to a few layers of moisture-proof plywood which are then attached to the joists. Pipework or ducts ...
The Wheeling Corrugating Company out of Wheeling, West Virginia, became the leading tin ceiling manufacturer in the late 1800s. At that time, Wheeling Corrugating was a large steel mill that also made products from their steel sheets such as roofing and siding. [6] Sheets of tin were stamped one at a time using rope drop hammers and cast iron ...
Air returns from the room at ceiling level or the maximum allowable height above the occupied zone. [1] The UFAD system takes advantage of the thermal plume and stratification phenomenon: the conditioned air is supplied directly to the occupied zone (OZ). The thermal plumes generated by the occupants and other heat sources introduce the ...