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* In ''VideoGame/{{Subnautica}}'', you can occasionally find aquatic ventilation shafts built by unknown aliens for an unknown purpose. Most creatures avoid them, but tiny Peeper fish can and do swim in and out with ease. [[spoiler: The captive, colossal Sea Emperor has been telepathically directing the Peepers to do so. Her/Its Enzyme 42 is the only cure for the local plague, so she's using the Peepers to distribute it.]]

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* ''VideoGame/FrostyNights'': One of the {{Snowlem}}s, Yellow, will attempt to enter your room through the vents.



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* Used against the player in ''VideoGame/SCPContainmentBreach''. SCP-173 uses these to get around the entire facility, and most of its spawn points are signified by a broken vent in the room.


* The titular character of the ''Franchise/SlyCooper'' series can do this in all his games. He usually does to break into places.

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* The titular character of the ''Franchise/SlyCooper'' ''VideoGame/SlyCooper'' series can do this in all his games. He usually does to break into places.

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[[AirVentPassageway Air-Vent Passageways]] in video games.
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* One level of ''Series/TwentyFour: The Game'' has Kim Bauer, armed only with a taser, having to crawl through ducts to get around a room full of bad guys. She has to move very slowly, though, or they'll hear her and shoot.
* Most videogames based off the ''Franchise/{{Alien}}'' franchise will naturally have this option accessible for both Alien and human characters at some point, but special mention should be made for ''VideoGame/AlienIsolation'', where this method of getting around becomes the standard once Sevastapol has gone to hell, both to avoid Working Joes and violent civilians. They're noisy to open and move around in, which will draw the xeno's attention; they're dark as hell and can have multiple dead ends; they disrupt your tracker and make it impossible to know if the xeno is nearby; and if the xeno gets in with you (which it will), you'd better hope you had the sense to bring a molotov.
* ''VideoGame/AliensVsPredator 2'' (the game, not the movie) featured liberal amounts of duct crawling. The first few levels of the [[SpaceMarine Marine]] campaign required constant duct crawling, including a situation where Frosty has to jump into a duct vent that a Xenomorph recently launched out of in order to avoid being eaten. The Alien campaign, however, was almost entirely composed of duct jumping for most of the early half of the game.
* Danny in ''VideoGame/AngelsOfDeath'', after initiating the building auto-destruction and the stairs just couldn't be an option. He appears out of nowhere and [[spoiler: shoots Rachel]].
* ''VideoGame/AntiVillain'' has some in the facility Rory has to escape to prove himself as a villain initiate. A bulletin board notice from management states that employees should stop using them due to safety issues, no matter how fun it is.
* ''VideoGame/ArmoredCore'' has the player chase after terrorist mechs who have escaped through air tunnels. In two-story tall mechs. It's sort of {{justified|Trope}}, as these are the vents that are supposed to serve an underground city. Just don't [[FridgeLogic think about how that would actually work]].
* This happens a lot in ''VideoGame/BatmanArkhamAsylum''. Whenever opening doors, stealth or jumps are impossible, a conveniently placed vent will always be there to be busted open to save the day, and help you proceed. Sort of justified by the fact that Arkham Asylum is famous for having horrible security. Also, many of the buildings in Arkham are very old (the asylum as a whole dates back to the mid 19th Century), so the vents are likely from an old ventilation system. Every building in later Arkham games got their air vents from the same contractor, especially when there's a Predator mission in the building.
* ''VideoGame/Battlefield2142''. The Titans have vents on the top that provide an alternate way to enter, however, unless the other team if full of idiots, they are usually boobytraped or being guarded by someone armed usually with a shotgun or a LMG.
* Lots of duct-crawling goes down in ''VideoGame/BeyondGoodAndEvil''. Jade makes use of air vents once or twice in order to break into a few facilities, but Double H tends to do it whenever he and Jade [[LetsSplitUpGang split up]] in order to follow her. He ''slides out of one'' during the third boss fight, [[BigDamnHeroes rocketing to the rescue.]]
%%* ''VideoGame/BioShock1'' does this too.
* ''VideoGame/BioshockInfinite'', ''BioshockInfinite/BurialAtSea'' DLC. Elizabeth can use air vents to access areas not available to normal travel and avoid enemies.
* Though technically not an air vent, one mission in ''VideoGame/CallOfDuty 2'' involves a group of Russian soldiers infiltrating a German-held railway station via a long, damaged fuel pipe. The Germans are quick to catch on, though, and if he player isn't careful he can get caught by gunfire or hand grenades.
** In the final act of ''VideoGame/ModernWarfare'', you infiltrate Zakhaev's [[YeOldeNuclearSilo missile base]] through the vent system.
* In ''VideoGame/ChronoTrigger'', you can sneak around the Blackbird by using airducts. Or you can bring Ayla to your party and avoid the issue of [[NoGearLevel lacking weapons]] altogether.
* ''VideoGame/ContagionMonochrome'' has them in the Escape map, Roanoke Police Department. Zombies can use them as shortcuts to get through different parts of the map.
* Some ''VideoGame/CounterStrike'' maps feature this. E.g. on cs_assault, there is a large air vent that leads from the hangar roof to the room with the hostages. Appropriately, walking through it makes a lot of noise and it can be shot through to kill whoever is inside.
* In ''VideoGame/DarkFall: Lights Out'', Parker must crawl through an air duct to reach [[spoiler: the future-era laboratory complex. As he must navigate the high-tech duct system using a 1910s bullseye lantern to illuminate his path, it's a real AnachronismStew of a scene]].
* ''VideoGame/TheDarksideDetective'':
** In the chapter "Police Farce", [=McQueen=] accidentally breaks a section of air duct in the precinct house while attempting to mend it. He remarks that if anybody asks him what happened to it, he's going to claim it was broken by a maverick police officer crawling around inside the duct.
** [=McQueen=] gets to do some actual duct-crawling in the ChristmasEpisode, as part of a shout-out to ''Film/DieHard''.
* ''VideoGame/DeadRising'' has Frank West use air vents as passages to and from the safe rooms, as Otis welds the actual door shut to keep the zombies out. As ''Dead Rising'' takes place in a mall as well, it's likely a homage to ''Film/DawnOfTheDead''.
* ''VideoGame/DeadSpace''
** The ship in which the game takes place is blanketed with enormous, easy access vent shafts that the Necromorph enemies use to move around at will. This allows them to bypass security lockdowns and quarantines with impunity, rendering such measures useful only as an obstacle to the player. This continues into the design of the space station where the sequel is set, and protagonist Isaac Clarke gets to crawl through a few special engineer-only vents himself to get from place to place.
** In the RailShooter prequel ''Extraction'', you do get to crawl through the vents and similar locales several times, but it's {{lampshade|Hanging}}d that they are tight, cramped and hard to move quickly in. The fact you only face Leapers and Crawlers in them only makes it worse.
* ''VideoGame/DeusEx''
** The game often includes alternate paths through air vents, which usually double as maintenance tunnels, complete with ladders and hinged grates. One of the {{N|onPlayerCharacter}}PCs even explicitly suggests it as a stealth route in the first mission, saying that "these 20th century buildings always have ventilation shafts". However, unlike ''VideoGame/DukeNukem'', there's also always a straight way.
** Mildly subverted in ''VideoGame/DeusExInvisibleWar''; all the vents are comfortably navigable, but inevitably are patrolled by small, spider-like security bots armed with electrical shock-based weapons. According to characters, the bots are to combat any vermin that might enter the vents.
** And just because it was such a big part of the first game, in ''VideoGame/DeusExHumanRevolution'', air vents abound, often leading to rooms with a couple of neat little bonuses, or an easy way around the guards. This is even {{lampshade|Hanging}}d in an early conversation, where someone asks if the reason you took so long getting to his office is if you got stuck in an air duct. And not too long after, during the first mission, if you sneak in, when asked how he got in, the player character explains that he used the air-duct, and is going to include them in his presentation about security loopholes.
* ''VideoGame/{{Dishonored}}'' uses this trope in a quite realistic way: you can use air ducts to infiltrate buildings and, in one case, to escape captivity, but you need a special power that allows you to possess a rat to do so.
* ''VideoGame/DukeNukem3D'' did this so often that there is a small monster almost designed to be placed in the vents. In the expansion pack, the game has a nod to the famous air vent scene in the first ''Film/MissionImpossible'' movie.
* In ''VideoGame/{{Erie}}'', these adult-man-sized ducts are the player's saving grace. The game heavily consist of sprinting away for your life from mutant monsters and luckily, they can't fit in vents.
* ''VideoGame/EscapeFromButcherBay'', in which the ducts were used so widely they actually had directions scribbled inside them. ''VideoGame/AssaultOnDarkAthena'' continues this.
* ''VideoGame/TheEvilWithin2'' has Sebastian flee from Stefano's Gruesome Giggling Guardian by doing this, barely avoiding a GroinAttack in the process!
* In ''VideoGame/TheFeebleFiles'', Feeble has to crawl through a bunch of vents in the last sequence of the game in order to solve a number of puzzles.
* ''VideoGame/FinalFantasyVII'' in numerous places, most notably in Shinra tower when the player eavesdrops on the evil corporate meeting from a ventilation duct connecting to a bathroom.
* ''VideoGame/FirstEncounterAssaultRecon'' requires you to travel through air ducts several times per level in order to advance deeper into the facilities you're penetrating, whose covers are quite easily bashed in. Strangely, despite the game's horror atmosphere and the obvious darkness and claustrophobia factors, you are never once subjected to any sort of scare sequence within one. ''Except'' one. During one particular part, you turn the corner, and Alma does the spider-crawl towards you -- before vanishing a foot away from you. Alma seems to use this, popping out of an air vent right in front of you on one occasion. While you're utterly defenseless. On a ladder.
* ''VideoGame/FiveNightsAtFreddys2'' ups the ante on the danger posed by the killer animatronics by including a pair of vents leading right to the security room, which you also have to keep an eye on. At the very least there are cameras in both vents and lights at the bits leading into your office - though why they're even big enough for the massive animatronics to crawl through is another matter entirely.
** Continued in ''VideoGame/FiveNightsAtFreddys3'', as there are two ventways into your office that BigBad Springtrap can crawl through, but this time you are able to shut off individual vents to slow his progress. However, they tend to malfunction constantly, giving you {{Hallucinations}} if not careful.
** In ''VideoGame/FiveNightsAtFreddysSisterLocation'', however, ''you'' are the one doing this instead. Nothing can actually get you in there, though the game certainly pulls no punches in suggesting something might. [[spoiler:The secret alternate night also has vents that Ennard can crawl through, serving the same purpose with the same mechanics as in ''3''.]]
** ''VideoGame/FreddyFazbearsPizzeriaSimulator'' takes this to its logical conclusion - the ''entirety'' of the map is vents, bar your office at the back and the [[spoiler:fake]] Pizzeria in the middle of it. It is a literal maze that animatronics can freely travel through - and there're no cameras, forcing you to use other forms of detection (specifically audio and motion tracking) to keep them away. The Ultimate Custom Night also contains a couple of vents for animatronics to roam around in - Springtrap returns to crawling through them, as does Ennard, and joined by a whole batch of the [[LoadsAndLoadsOfCharacters 50-plus characters]], each with their own mechanics.
* In ''Fran Bow'', Fran has to use one to escape from the psychiatrist's office after Phil locks her in. Since she's a child, it's semi-plausible.
* Used in a level in ''VideoGame/{{Geist}}''; Raimi [[GrandTheftMe possesses]] a dog to get through the vents. It appears to be a boxer-type dog, and can't stand up in the vent.
* ''VideoGame/GoldenEye1997'' began one level with the player infiltrating a Russian base via the air vents.
* In ''VideoGame/GoldenSunTheLostAge'', Felix and gang sneak into the Great Gabomba Statue, a clockwork statue worshipped as a god by a stereotypical Sub-Saharan African-like tribe, through the ventilation shaft, since the original builder's entrance has been sealed with a big rock.
%%* ''VideoGame/Grandia1'' had this, including a side-trip to the women's locker-room...
* ''VideoGame/HalfLife''
** Subverted in ''VideoGame/HalfLife1''. At one point, the character is forced to crawl through an airvent. In a scripted scene, soldiers below hear the player, yell "Sir, I hear something!" and shoot into the air duct, causing it to collapse. Whether or not you're in it is a matter of timing. If you have the sense to immediately stop when they yell that line, you'll have a consummate OhCrap moment as you see the vent in front of you getting perforated.
** In another instance, the guards hear you and toss a satchel charge in for an OutrunTheFireball sequence. Some of ''Half-Life'''s vents have ladders in them, suggesting that they may have been designed to allow people to go through them. Mr. Freeman crawls through the vents wearing what is a [[PoweredArmor high-tech suit of platemail]]. But considering how [[ElaborateUndergroundBase deep]] the Black Mesa facility stretches, perhaps it is not quite unrealistic that it would use people-sized vents.
** ''VideoGame/HalfLife2: Episode 1'' mentions that Freeman used to participate in races to break into Dr. Kleiner's office when he locked his keys inside. Naturally, the air vents are now full of headcrabs. And subverted in the same game, where one vent you crawl through collapses, landing in a room filled with ExplodingBarrels and laser-tripwire mines.
* Both played straight and subverted, for unsettling effect, in ''VideoGame/HeavyRain'', where Ethan Mars is guided by a serial killer through series of ''Film/Se7en''-style trials. One of them involves deliberately crawling into something that resembles both a system of wide air ducts and a dangerous exhausts vent (it sounds stupid, but looks appropriately menacing). The vent system is one foot high and branching, it's absolutely dark and hard to breathe there, and its floor is ''covered with broken glass''.
* The online game ''Infantry'' has a "Bug Hunt" map, allowing players to play as humans or aliens, the aliens granted the advantage of traveling by air ducts and launching ambushes from them.
* In ''VideoGame/JurassicParkTheGame'', Jess uses one to access the geothermal generator in the third episode, much to Gerry's anger. [[spoiler: The ''Troodon'' use them to get around the facility, and try to break in to the room containing the heroes by using vents.]]
* Shows up in ''VideoGame/KingdomHeartsIII'', of all places, when the heroes visit the world of ''Franchise/ToyStory''. As they're all transformed into LivingToys, the vents have plenty of room for them and the Heartless they're fighting.
* Valve [[LampshadeHanging hangs a lampshade]] on this trope in ''VideoGame/Left4Dead2'' with the ever-epic lines of Ellis; In Dark Carnival, he says "if there's one thing video games have taught me, it's that good shit comes from crawlin' through vents". Though unlike in ''VideoGame/HalfLife'', the vents in the level he utters the line in do not lead to anything more important than an alternate route. On the other hand, some [[GameMod custom campaigns]] make them the mandatory route.
* Used extensively in ''VideoGame/TheLegendOfHeroesTrailsOfColdSteel II'' and ''III'' where the party has to go through the vents to proceed through the levels. Various levels of enthusiasm vary with at least one character commenting on using these.
* A cutscene near the beginning of ''VideoGame/LiveALive'''s sci-fi chapter shows the crew of ''Cogito Ergosum'' inspecting an airduct which [[ChekhovsGun predictably]] the RobotBuddy protagonist uses in the climax to evade the behemoth on the loose.
* ''Franchise/MassEffect''
** While Shepard never has to enter a vent in ''VideoGame/MassEffect2'', there are a few instances or references of vent use in the game.
*** Thane Krios uses one during his recruitment mission. You can actually hear a clunk while he's in there before he makes his big entrance.
*** During the suicide mission, the chosen Tech Expert has to move through a duct, while the player has to fight off the Collectors in order to open the valves for them. That instance should probably count as a subversion, in that the game makes very clear how ''very'' dangerous it is, and that the tech expert would have died, hideously, were it not for Shepard's help. At some points you can see them and the ducts are actually tall enough to let them ''walk through''.
*** Most disturbingly, during Thane's Loyalty mission, Captain Bailey mentions Duct Rats, homeless children who travel in the Citadel's ventilation system. Played straight, as some of the vents can lead to [[DeadlyRotaryFan razor sharp fans]], [[NotTheFallThatKillsYou sheer drops]], [[StewedAlive protein vats]], [[ContinuousDecompression depressurized vents]], or being [[ThrownOutTheAirlock spaced]].
** Used by Liara in ''VideoGame/MassEffect3'' to escape from some Cerberus troopers. True to their real-life counterpart, they are extremely noisy - the player can hear the vents being banged around by Liara and the Cerberus troops clear across a large parking garage. While the vents are very large, the troopers have trouble getting around in their bulky armor; they repeatedly try to shoot her, but aren't able to aim and just further ventilate the shaft. There's a little boy on Earth in a smaller vent at ground level. The sound of him moving around in there is actually the only reason Shepard detects him.
** During the Citadel DLC, [[spoiler:temporary ally Maya Brooks has to crawl through the vent of a casino to disable the door to the panic room, all the while avoiding alarms until Shepard disables them.]]
* ''VideoGame/MaxPayne3'' subverts this when Max scrambles into an air duct just big enough to fit him to escape a room full of tear gas. After awkwardly maneuvering himself along for a few moments, he finds out the hard way that just cause it ''fits'' him doesn't mean it can ''support'' him...
-->'''Max''': I was trying to work out what direction I was headed in when I discovered some more Brazilian architecture not designed for the "American physique".
* The ''Jim Dandy'' from ''VideoGame/MDK2'' has a few air-vents that the protagonists can comfortably walk through without even needing to crouch. They are also wide enough that two people could walk abreast.
* Occurs at least once in most of the ''VideoGame/MedalOfHonor'' games, such as the last level of Mission 2 in ''Allied Assault''.
* ''VideoGame/{{Messiah}}'' has vents big enough for Bob (who is the size of a baby) to crawl through. There are also smaller vents, which you can explore while you're possessing the body of a rat.
* Frequent in the ''VideoGame/MetalGear'' series.
** In ''VideoGame/MetalGear2SolidSnake'', said vents are occasionally guarded by the [[MemeticMutation memetically infamous]] Poisonous Zanzibar Hamsters.
** One of the first areas in ''VideoGame/MetalGearSolid'' has an otherwise level air duct with a lowered section in it. Said lowered section is ''flooded'', which would render the duct useless for ventilation. Perhaps justified given the Shadow Moses base shows many signs of poor maintenance.
** Very blatant in ''Portable Ops'', which opens up with Snake escaping from a prison by crawling through the air vents.
* Apparently, design standards in the ''Franchise/{{Metroid}}'' universe include a provision that all facilities and spacecraft must have access tunnels, air shafts, or other openings big enough for Samus Aran's Morph Ball form. (Expanded and partially subverted in ''Zero Mission'', wherein after losing her armor, Samus must negotiate said tunnels on her hands and knees, which is dead slow, and Space Pirates can also use the tunnels, largely negating their escape value.) More accurately, it seems all maintenance robots (which use the tunnels) are the same size as the Morph Ball.
** There's a prevailing theory (with some canon evidence) that nearly all modern technology is based on that of the [[{{Precursors}} Chozo]] unless stated otherwise and most races are too afraid to tinker with the design fundamentals unless their whole project blows up. Naturally, the Chozo would have no problem making their vent shafts just the right size for their PoweredArmor warriors to take a shortcut through.
* ''VideoGame/MirrorsEdge'' features a number of extremely large (and life-saving) air vents. {{Lampshade|Hanging}}d in one instance when Faith does this and a guard can be heard below exclaiming "Wow, the rats must be ''huge'' in here!"
* ''VideoGame/{{Monaco}}'', being largely an homage to heist films, features air vents as a very convenient way to get around each floor unnoticed, assuming they go where you need them to. Hilariously, not only will nobody hear you as you walk through them, but if an NPC decides to enter one, they can ''pass directly through you'' without so much as raising any suspicion. If you play as The Cleaner, you'll even knock them out as they pass by.
* In the ''VideoGame/{{Myst}}'' universe we have a justified version of the mine example: D'ni is an underground city, and its Great Shaft is a huge air exchange shaft. But it's also used as the primary method of reaching the surface (or vice versa).
* ''VideoGame/PajamaSam 4'' has the titular character doing this at the end of the game, even though it simply leads to the ceiling of the same room.
* ''VideoGame/PaperMarioTheThousandYearDoor'' has Mario go through air ducts twice in the course of plot in order to eavesdrop. He may also go through a third in order to gain an item.
* The ''VideoGame/{{Penumbra}}'' games have these from time to time within the series. The first game has a few in the mine's storage cells, and from the textures, they actually look pretty dusty. In the second, Philip has to take the screws off a vent's cover to go in; apparently one of the scientists, Niel Oswald, had gone that way as well and left notes and red marks for someone to follow. And near the end of the second game, a third is hidden behind [[ConcealingCanvas a rather out-of-place landscape painting.]] At one point, Philip also mentions that the air smells rotten even though the air circulation is on.
%%* Which reappeared in ''VideoGame/PerfectDark''. Gunfire in toilets. Always classy.
* A series of maintenance tunnels in ''VideoGame/ThePerilsOfAkumos'' prove to be this. A separate series of air vents also prove plot-relevant.
* In ''VideoGame/Persona5'', sneaking through air vents is sometimes the only way to advance from one area of a palace to another.
* In ''Phantasmat 7: Reign of Shadows'' the main character has to ''answer riddles'' in order to properly navigate the air ducts leading to Dr. Corvine's private section of the Arcadia Resort.
* ''VideoGame/{{Portal 2}}''
** A variant on this: At one point, Chell uses the ductwork of old Aperture [[spoiler:to apply conversion gel in otherwise unreachable locations. She also uses access shafts and tunnels at some points.]]
** The Perpetual Testing DLC features [[http://i1.theportalwiki.net/img/0/03/Cave_Johnson_dlc2_0520_altcave_penal_science02.wav a clip]] of an AlternateUniverse Cave Johnson warning people not to try this inside his space prison.
--->'''Cave:''' Attention, test prisoners attempting to escape through the air ducts. [[ThisIsReality I don't know what nonsense you learned on TV, but in real life,]] air ducts [[RealityEnsues just go to the air conditioning unit.]] It's also pretty dusty, so if you've got asthma chances are you're gonna die up there. And we'll be smelling it for weeks, because, again, the air ducts aren't a secret escape hatch; they're how we ventilate the facility.
* In ''VideoGame/RatchetAndClank'' you never actually climb inside the vents, although Clank would certainly be small enough to have one of his missions in there, but at one point you break into a building by climbing on the outside of external air vents with Magnet Boots.
* This is how VideoGame/{{Rayman}} escapes the [[SpacePirates pirate's]] [[CoolAirship prison ship]] in ''Rayman 2''. Considering that was an air vent, which is never really explained. Judging by its size, it's more likely to be where the smaller warships are sent from, if not from the deck.
* The demon in ''[[VideoGame/{{Reincarnation}} Reincarnation: Riley's Out Again]]'' does this to get around the school without being spotted by humans, but it's so "[[ScrappyLevel tedious and unfun]]" that later versions added an option to skip the sequence altogether. He's seen doing it again in a mini later in the series.
** Also used in ''In the Name of Evil'', but thankfully without the maze.
* Played straight in ''VideoGame/{{Resistance}}: Fall of Man'' when Parker uses a vent that pops open to escape from the conversion center, leaving Hale to find his own way out.
* Phil does this to escape his room at the beginning of ''VideoGame/RiddleSchool 5''. He's a child, so the size issue isn't relevant.
* ''VideoGame/SecretOfEvermore'' had an escape through the ventilation system take up a ''dungeon''. Fortunately, to make up for the confusion of navigating the vents, the game followed the trope pretty well by having no enemies inside them.
%%* ''VideoGame/ShadowComplex'' uses vents where Metroid uses morph ball tunnels.
* The titular character of the ''Franchise/SlyCooper'' series can do this in all his games. He usually does to break into places.
* In ''VideoGame/SpiderMan'', Spider-Man has to escape from an underwater base using the air ducts... ''which are big enough for him to web-swing through''. Talk about shoddy design....
* Sam Fisher of ''VideoGame/SplinterCell'' has an odd ability to encounter ridiculously large vents with grates off to get into areas that would otherwise be unreachable. Somehow, a guy carrying a large gun as well as a few pounds worth of other weapons and gadgets doesn't make enough sound to alert anyone. There's a particularly bizarre instance in the first game where Sam makes his way into a walk-in freezer. Given that the vent in question is connected to a regular part of the building, it means the vent is just wasting coolant.
* ''VideoGame/SpyFox'' starts with this in the third game, ''Operation Ozone'', infiltrating an enemy base through the restroom's ceiling vent.
* In episode one of ''VideoGame/StrongBadsCoolGameForAttractivePeople'', Strong Bad must use the air vent to sneak past The Poopsmith while infiltrating the King of Town's castle. However, unlike some other examples here, you can get caught if you aren't careful.
* Justified in ''Videogame/StyxMasterOfShadows''. Styx, being a goblin significantly smaller than a human, can crawl through many ventilation shafts and pipes that are way too small for a human. [[spoiler: Although this may sound like a security oversight, when the Atrium was built, there was no such thing in existence as a goblin.]]
* Twice in ''VideoGame/SyphonFilter2'', first in the Pharcom Expo Center, then in the Agency Biolab.
* ''VideoGame/SystemShock''. The second game almost starts with one, and the first game had whole maintenance tunnels in addition to vents.
* Most of the air vents in ''Videogame/TeamFortress2'' are inaccessible and just for decoration, but there are a few in Hydro that are big enough for players (even the Heavy Weapons Guy) to stand up in. Custom-map-made-official Turbine has a system of these that's more of a cramped hallway than a vent.]
** One sadistic mapmaker made a version of Turbine [[https://www.youtube.com/watch?v=Y1UgiFPgLyE where the vents are literally a maze leading from one spawn to the other]].
* In ''VideoGame/TheThing2002'' videogame, at one point Blair acquires access to another room by walking hunched through a four-foot-wide air duct.
* ''VideoGame/VampireTheMasqueradeBloodlines'' has a series of air vents (with ladders leading to them, no less) in the garage in the Downtown area. During the mission for Fat Larry that takes you there, a stealthy character can make good use of them and avoid combat entirely- a good idea, as the enemies there are heavily armed and quite numerous. Later in the game when a mafia bouncer blocks your progress, Malkavian characters can ask the bouncer if there are any vents that they can use instead.
* ''VideoGame/{{Warframe}}'': Both Grineer and Corpus maps have plenty of air vents big enough for a warframe to walk through (Infested maps have them as well, but they're overgrown with MeatMoss.) Grineer maps tend to require them to progress through the level, while in Corpus maps they're usually optional for stealth.
* Partially subverted in ''VideoGame/{{Wild ARMs|1}}'': only Hanpan, the little mouse sprite belonging to one of the main characters, is small enough to navigate the air vents.
* The [[HoldTheLine base-defense mission]] in ''[[VideoGame/XCOMEnemyUnknown XCOM: Enemy Within]]'' has the aliens using air vents to gain access to part of the XCOM base. {{Justified|Trope}} in that the aliens coming through the air vents are either Sectoids or Thin Men; the former are very small, while the latter are incredibly flexible.
* ''VideoGame/{{XIII}}'' has this a lot. Justified in that the player tends to machine gun all the bad guys ahead of time so there's nobody left to hear him clunk clunk through the shafts.
* During Wolverine's escape from the Weapon X facility in the ''VideoGame/XMenOriginsWolverine'' game, he has to crawl through ventilation shafts a few times to avoid attention (thanks to his healing factor being temporarily disabled). In one of them, a guard down below yells about hearing something and starts riddling the shaft with bullet holes. Another guard tells him to stop being jumpy, and that it's ridiculous that Wolverine would be up there.

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