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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site plenum The space between a hanging ceiling and the floor above or roof; it usually contains HVAC ducts, electrical wiring, fire suppression system piping, etc. Related category    • BUILDING AND ARCHITECTURE Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP