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Turkana City cartographic database

A map of Turkana City showing various underground levels, including its ventilation and recirculation complex

Ventilation systems, or ventilating systems, were used throughout buildings, starships, starbases, and other facilities, to direct and control the flow of breatheable atmosphere. (TOS: "The Trouble with Tribbles"; VOY: "Year of Hell, Part II", "Message in a Bottle")

Turkana City had a ventilation and recirculation complex in one of its underground levels. (TNG: "Legacy")

In 2268, on stardate 3619.2, the dikironium cloud creature entered the USS Enterprise's ventilation system and subsequently killed one crewman and severely injured another. Captain James T. Kirk, Commander Spock, and Doctor Leonard McCoy then met and decided to drive the creature out of the ventilation system by flooding the system with radioactive waste. (TOS: "Obsession")

Later that year, on stardate 4523.3, tribbles infested Deep Space Station K-7 by moving through the station's ventilation ducts, allowing them access to the station's grain storage area. (TOS: "The Trouble with Tribbles")

In 2269, on stardate 4978.5, the crew of the Enterprise became intoxicated by the effects of Harry Mudd's love potion, which was disseminated throughout the ship using the ventilation system. (TAS: "Mudd's Passion")

In 2371, on stardate 48846.5 bacterial cultures which Neelix used to create Brill cheese got into USS Voyager's ventilation system and shut down or infected the ship's gel packs. B'Elanna Torres, Kes, and The Doctor killed the virus by heating the gel packs and raising the ship's temperature by inverting the warp field. (VOY: "Learning Curve")

Indoor nebula

Nebular gas flooding one of Voyager's decks due to the faulty ventilation system

In an alternate 2374, the ventilation system on board the USS Voyager began to fail – as a result of constant attacks from the Krenim Imperium – which allowed gas from a class 9 nebula to flood one of the last habitable decks on the ship. (VOY: "Year of Hell, Part II")

Later that year, on stardate 51462, The Doctor and the EMH Mark II of the USS Prometheus dispersed neurozine gas throughout the Prometheus using the ventilation system, incapacitating a group of Romulan hijackers. (VOY: "Message in a Bottle")

In the writers' second draft script of ENT: "Breaking the Ice", Commander Trip Tucker attempted to account for a bruise on his cheek by telling Captain Archer that he'd received it because he'd become "a little careless inside a ventilating unit." As Archer suspected, however, the bruise was actually a result of T'Pol having hit Tucker while they had been sparring.
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