An enclosed passageway in which to direct air or other gaseous current along.
A pipe or duct that carries gaseous combustion products away from the point of combustion (such as a furnace).
In an organ flue pipe, the opening between the lower lip and the languet.
A device that circulates fresh air and expels stale or noxious air.
A machine that moves breathable air into and out of the lungs of a patient who is unable to breathe sufficiently.
Some behaviour or happening that relieves a tense atmosphere or situation.