The meaning of PLENUM is a space or all space every part of which is full of matter.

PLENUM definition: the state or a space in which a gas, usually air, is contained at a pressure greater than atmospheric pressure. See examples of plenum used in a sentence.

Plenum: a compartment or chamber to which one or more air ducts are connected and that forms part of the air distribution system.

PLENUM definition: 1. a meeting at which all the members of a group or organization are present: 2. a meeting at…. Learn more.

What is an HVAC plenum? A plenum is a box made of sheet metal. It connects your HVAC system’s air handler to your ductwork. Your HVAC system creates cool or warm air depending on the season. …

Define plenum. plenum synonyms, plenum pronunciation, plenum translation, English dictionary definition of plenum. n. pl. ple·nums or ple·na 1. An assembly or meeting with all members present. …

Jun 3, 2025 · A plenum is an air distribution box designed for forced-air systems on residential homes and commercial businesses. It is part of the ductwork, but far different than an air duct as these …

Factsheet What does the word plenum mean? There are five meanings listed in OED's entry for the word plenum. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

Sep 16, 2024 · A plenum refers to a space within a building that serves as a cavity for air circulation or other utilities. It is typically used to describe the area between the structural ceiling and the dropped …

Dec 11, 2025 · Noun plenum (plural plenums or plena) (physics) A space that is completely filled with matter.