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Explanation: Veja a explicação abaixo para "plenum", obtida no site abaixo indicado:
The term "plenum" refers to open spaces in commercial buildings, typically over suspended ceilings or beneath raised floors. Plenum spaces are usually part of a building’s air handling system, and connect many parts of the building and can be a route of fire propagation and smoke distribution throughout the structure during a fire if not properly designed and constructed. Because plenum spaces are typically hidden with either ceiling or floor tiles, the location of fires within them can be difficult to detect. For these reasons any materials used in plenum spaces are required to meet strict flammability and smoke generation requirements.