In an organ flue pipe, the opening between the lower lip and the languet.
A pipe or duct that carries gaseous combustion products away from the point of combustion (such as a furnace).
An enclosed passageway in which to direct air or other gaseous current along.
A thin-walled, cartilaginous tube connecting the larynx to the bronchi.
One of the cuticle-lined primary tubes in the respiratory system of an insect, which extend throughout its body.