plenum chamber
noun
1(In a ventilation, heating, etc., system) an enclosed space into which the outside air is forced (after any conditioning) and from which ducts lead to outlets inside the building.
2Any analogous enclosed space in which a higher pressure is maintained by the forcing in of air, as in some air-cooled engines, ramjets, hovercraft, etc.
Origin
Early 20th century.
- have a bee in one's bonnet
- have a bird
- haveable
- have a bone to pick with someone
- have a bun in the oven
- have a cadenza
- have a care
- have a care (or an eye etc.)
- have a clue
- have a cow
- have a feel for
- have a few
- have a finger in every pie
- have a finger in the pie
- have a foot in both camps
- have a frog in one's throat
- haveage
- have-a-go
- have a go at
- have a (good) run for one's money
- have a hand in something
- have a heart
- have a heart of gold
- have a lash at
- have all day