a building's air/heating/ventilation 'ducts'
the bile 'duct'
tear 'ducts'
(..) are gone. - Is that it? - No, hold on. We can't fix it out here anyway, and we need to reroute... - a couple of these ducts, wouldn't you say, Brett? - Dry dock time. Dry dock. Tell her we need to dry-dock. Look, we couldn't fix it out here anyway. We gotta reroute all these ducts... and in order to do that we've got to dry-dock. What else? Some fragments caked up... and we've got to clean it all out (..)1979 Alien