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  • Played straight in a book based on the Donkey Kong Country series, Donkey Kong was trying to get to a room containing an auto defense system in a building being built by Kremlings. As he tries to think of a way to get to the 8th floor without being seen, he hears guards coming, and goes into a nearby ventilation shaft. It's big enough to crawl through, and even has signs pointing him in the right direction.
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  • Animorphs: Averted, since the one time this trope is used, Marco's in bug morph.
  • Duumvirate: The small kids who live in Northberg Educational Facility discover that they can go anywhere they want in the air vents. And the child-sized "secret" areas they lead to.
  • James Bond escapes confinement in Dr. No through some ductwork, but he soon discovers that it was a purposefully-built series of hazardous obstacles (poisonous spiders, extreme heat, etc.), complete with viewports for entertainment, intended as a deliberate obstacle course set up by Dr. No.
  • Justified in the sci-fi book Footfall, as the aliens are twice human size and deliberately put the captured humans to work cleaning the spacecraft's air ducts. Their prison cell also doesn't contain a handy air duct, forcing them to escape before using the ducts to evade.
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  • In Illegal Aliens by Nick Pollotta and Phil Foglio, abducted humans on an alien ship hide in the air vents, because all the movies say that's what you do in that situation — only they aren't air vents; they're conduits for a horrifically deadly gas weapon, which the aliens are preparing to flood throughout the ship, because they can't locate the humans....
  • Something similar to the above happens in Artemis Fowl: The Arctic Incident. Artemis has to crawl through a duct filled with fuel for the building's plasma weapons. Before his helmet runs out of air. Without being able to see where he's going. Knowing full well that if anyone turns on the plasma cannons, he's toast. Once he gets out, he has to be sprayed with anti-radiation foam or he'll likely develop cancer.
  • Subverted in Christopher Brookmyre's One Fine Day in the Middle of the Night. After an earlier discussion of action movie tropes, one of the heroes spots the "Holy Grille" as the way out when they're held hostage. Unfortunately, he didn't reckon on the fact that crawling through metal ductwork is incredibly noisy, so everyone hears him as he tries to squeeze through.
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  • Justified in Ender's Shadow. Bean uses the air ducts to explore and reconnoiter, but he can only do it because he designed a specialized workout to develop the muscles he needs to pull himself through at odd angles, and because he's really, ridiculously small. Eventually he grows too big to use the outflow vents anymore, but by then he is the commander of Rabbit Army and so has access to the larger inflow vents.
  • Works better in Mrs. Frisby and the Rats of NIMH than in most stories due to the escapees being rats. Well, right up until the system starts ventilating. This is one of the scenes that, legend has it, convinced Disney to pass it by as an animated adaptation. Something about having a large part of the party wiped out faster than the Redshirt Army, and without even an enemy to credit for it. They need help in opening the grilles, too.
  • Parodied in The Adventures of Samurai Cat, in which a cruise ship's air vents "... appear to have been designed for covert transportation." — "That would explain the moving walkways and vending machines."
  • Lyra crawls around in the dropped ceiling in Bolvangar in Northern Lights. Being a twelve-year-old girl, she's smaller and lighter than most Action Heroes, but she gets caught anyway, and almost transformed into a soulless abomination. She's only saved because the Big Bad had a special interest in her, and was present.
  • Used in the Honor Harrington spinoff Crown of Slaves, but used more realistically than many examples. Crawling around in them is murderously hard work, characters without detailed schematics get badly lost, and it proves almost impossible to remove a grille without the proper tools. Additionally, the ducts in question are on a space station and are deliberately designed to be large enough to crawl through since they double as maintenance access passages.
  • Referenced in Terry Pratchett's Only You Can Save Mankind:
    "I saw a film where there was an alien crawling around inside a spaceship's air ducts and it could come out wherever it liked," said Johnny reproachfully.
    "Doubtless it had a map," said the Captain.
  • Pratchett also pokes fun at the trope in Going Postal when, after a character fails to tunnel out of his jail cell, a guard remarks that the last guy in that cell — who happened to be unusually small and nimble — managed to squeeze through a tiny drain in the floor. Unfortunately, it didn't lead to the river like he thought.
    "He was really upset when we fished him out!"
  • Used and lampshaded in John C. Wright's Fugitives Of Chaos, Vanity—who has the power to find-slash-create hidden passages—finds an accessible air vent.
  • In Sandy Mitchell's Ciaphas Cain series:
    • In Cain's Last Stand, the air vents are exactly the place genestealers like to hide.
    • In other books, following a close call in Death or Glory, Cain makes a point of always acquiring the access codes to the maintenance conduits whenever he travels by ship. In one occasion where he didn't find the time to do so, Jurgen brought to his attention the fact that he was in a civilian ship, therefore its maintenance conduits didn't require access codes.
  • Used in the last two books of Timothy Zahn's Dragonback series; the (less-than-subtle) justification is that large air vents are actually standard design in capital ships, so that in the event of a hull breach emergency air supplies can be funneled to the compromised areas in large amounts, buying the occupants time to reach emergency air masks and so on. Although humans can't fit through them as it is, so it can almost be call a lampshading. Shontine/K'da ships are actually designed for the stealthy, compressible K'da to be able to move through in case of hostile takeover, and a human sourly remarks that he outgrew the ability to navigate even big ships' navigation ducts when he was seven. When a K'da takes to those vents for the first time she gets thoroughly lost; in a later escapade she's almost caught when her tail twitches in shock enough to thump a vent.
    • Played with in Zahn's Blackcollar novel The Backlash Mission, where the air intakes for a huge underground military base are large enough an adult human can walk through them, in order to accommodate the massive inflow needed and the filtering equipment to keep out poison gas attacks. Since even with the vents camoflaged, this is an insanely large security risk, the intakes are designed with a very large kill zone of automated defenses, which are described as completely undefeatable and possibly viable for centuries without maintenance. They actually were completely undefeatable. But with the base abandoned, there was no one to stop someone from spending months tunneling around the killbox.
  • Slightly altered in Harry Potter and the Chamber of Secrets, using the castle sewer-pipes for the monster to invade from — and for the heroes to find — the title chamber. Hogwarts Castle has got to have the most gigantic pipes ever seen... particularly for being built by wizards. Somewhat justified, in that the pipe leading to the chamber was designed to be a passageway to it, and thus capable of being accessed by the Heir of Slytherin. Likewise, a massive snake would have much more success than other monsters in navigating plumbing. Both had been planned by one of the people who helped create the Castle in the first place.
  • Comes up in several variations (breaking in, breaking out, air ducts, hanging ceilings...) in places in the Vorkosigan Saga by Lois McMaster Bujold, particularly the short story "Labyrinth" — where it involves problems like ducts forking or being blocked by grilles, and the others being only passable by the rather less than five-foot-tall main character, not his companions.
  • In Graham McNeill's Warhammer 40,000 novel Storm of Iron, this is how Hawke escapes a launching rocket and a Chaos Space Marine.
  • In the Women of the Otherworld short story "Chaotic" in the anthology Dates From Hell, Hope flees from a werewolf into an office, and finds herself in a dead end. She tries to escape through the air ducts, but she makes too much noise when moving and has to freeze when the werewolf enters the room. He finds her immediately. Later, after the pair has teamed up, they both move around through the air ducts, which are noisy, painful, cramped, and dusty. Still later, the bad guy enters a room looking for Hope, and while he's investigating the unscrewed air vent the good guys come out of their real hiding places and get the jump on him.
  • Averted in Robert A. Heinlein's Red Planet when one of the good guys proposes taking a vent grille off of a wall to get to the room on the other side. His friend points out that there will certainly be a similar grille on the other side, fastened by screws they won't be able to reach.
  • Isaac Asimov's Lucky Starr and the Oceans of Venus: Bigman volunteers to use an air vent in order to access a critical relay which, once disconnected, will prevent the Underwater City from drowning.
  • Deconstructed in Black Dogs. The ventilation in question is portrayed as tough, claustrophobic going in the dark, with Lyra, the protagonist, suffering several minor injuries, and a high chance of her falling and breaking her neck. Or breaking something else that renders her unable to escape, and dying slowly over several days.
  • Subverted in the final book of the Sten Series, by having the hero nearly get stuck in a claustrophobic moment.
  • Both played straight and subverted in John Ringo's Choosers of the Slain. They need to sneak into the secure facility of one of the bad guys, so (played straight) they pick the slimmest girl on the team, as the men on the team are too large especially wearing all their weapons. Subverted because they knew she would get stuck half-way down when the air vents narrowed, so her sole job was to get to that point and release a small robot (an R2-D2 toy they had picked up in a toy store and then modified to include surveillance and communications gear) which could go the rest of the way.
  • Used by Cammie and Macey in the third book of The Gallagher Girls series to get back into a building, though in this case it was still for escape rather than infiltration.
  • Subverted and lampshaded in Star Trek: Section 31: Abyss. After escaping her cell, Ezri Dax goes up into an air vent, which (contrary to what the holonovels of her youth would have her believe) is very dirty, dark, small and has creepy things living in it. (She is, however, successful in using the air vents to move throughout the base to important rooms.)
  • Subverted in A Certain Magical Index. In Volume 17 of the novels, Touma asks if he could use the ventilation ducts in the plane, but the flight attendant says that the ducts are too small. Touma admits that wasn't the plan and asks for some hot tea and coffee to pour down the duct, causing thermal expansion and make the terrorist on the other side think that there's someone crawling through the ducts, who lampshades that the act is just as suicidal as coming in through the actual entrance he was training his gun on. As a result, the terrorist gets some boiling hot tea to the face when he shoots the ducts, which also distracts him from Touma barrelling through the door and flinging a full pot of boiling coffee into his face.
  • Used in Age of Fire, where the two dragon siblings escape from a raid on their home cave by escaping through naturally formed air passageways.
  • In short story "In the Bone", the protagonist uses air ducts which were too small for his alien opponent but nonetheless navigable by the smaller human form. Some of the ducts are indeed too small for the human.
  • Justified in Witch & Wizard. In order to free innocent children being persecuted by the government for being witches and wizards from prison, the protagonist Wisty infiltrates one of the prisons through the air vents..... but she turns herself into a mouse first.
  • Played with in The Vampire Files. Jack can justifiably play this straight if he assumes a gaseous form (gas, after all, being what air vents are designed to let through). However, he's a bit claustrophobic and can't shake the feeling of being trapped while traversing a ten-inch-square conduit.
  • The Disreputable History of Frankie Landau Banks features the steam tunnel and pranking variant, as it is set at a school similar to MIT/Caltech mentioned above. It should be noted that this does not occur without consequences: one character gets a moderately-to-severe burn from the exposed pipes.
  • Somewhat altered in The 39 Clues: The Dead of Night, in which Phoenix Wizard and Reagan Holt try to escape the Vespers' prison by climbing up a dumbwaiter shaft. Justified, since the characters are children.
  • Averted and lampshaded in Sergey Lukyanenko's Competitors, when Valentin and Lena are confined to quarters in a Space Station. When Valentin suggests escaping via the air vents, Lena laughs that he watches too many movies and points out that the vents are barely a foot wide. Valentin's suggestion to set off the fire alarm has Lena point out that this would cause the quarters to be depressurized to contain the fire.
  • Under Alien Stars by Pamela F. Service has a crew from a hostile alien race take over a hotel, placing their prisoners on one floor. They remember to seal the edges of the air vents, but don't know or don't care about the garbage chutes descending past each floor.
  • In Michael Flynn's Spiral Arm novel In The Lion's Mouth, Bridget's first guess is such an escape before she deduces that in fact Ravn hid Invisibility Cloaks in the ventilation system, and then escaped, invisible, with her companion as soon as the door opened.
  • The Rings of Saturn: The space pirate base has an extensive air ventilation system, extensive enough that a Mad Scientist was able to live alongside the inhabitants and move around the base for years without their knowledge.
  • Sixty Eight Rooms: The two kids manage to fit easily in the Museum's air vents as they have been shrunk down to five inches. Getting up to the vents was much harder.
  • Cannon Fodder: Kelsey says she escaped from Black Jack's base in this way, but we never see it happen.
  • Attempted by Rolas in "Captive of the Red Vixen", after he figures out that his Shock Collar is only tied to the door to his cell, but he finds a note from his captor and a trap waiting for him at the grille above the lifeboats.
  • Averted in Get Blank when Blank uses a false ceiling, rather than any kind of duct, to get around.
  • Occurs in Heaven's Queen, third book of the Paradox Trilogy. When Brenton is helping Devi infiltrate Dark Star Station, he shows her a passage to crawl through and she assumes that it's an air vent. Brenton tells her that the people who built the station weren't that stupid; the passage is a power conduit, and usually filled with plasma heated to thousands of degrees. They're only able to use it as a passage because of a power outage.
  • In Symbiont, second book of the Parasitology series, Sally tries escaping captivity in a mall this way. She manages to make her way through the system only to find her guard Ronnie patiently waiting for her at the end; once he saw that she'd entered the vent, he was able to casually stroll over to the exit grating while she slowly crawled her way through the duct.
  • In the Dred Chronicles, the Prison Ship Perdition has enough of these that Tam, Dred's advisor, can use them to eavesdrop on rival gangs. This allows him to provide Dred with useful intelligence, which both protects the gang and encourages Dred to rely on him.
  • Andre Norton's Uncharted Stars. While on the pirate space station Waystar, Murdoc Jern's companion Eet enters the station's air ducts to do some snooping.
  • In Tales of Dunk and Egg, it's revealed at the end that Bloodraven had a few dwarfs sneak in through the privy to steal the dragon egg. Justified, seeing as they're dwarfs.
  • In Wander, Wander and Dagger use the airvents to escape from a nest of smilers set up in an abandoned prison.
  • The main characters use this method of travel at one point in H.I.V.E.. The trope is played a bit more realistically than usual: the vents are not well-lit, the characters are concerned about the noise they're making, their route has some difficult paths and "obstacles", and there's some mention of the effect that crawling along a cramped space would have. When entering the vents, they have to use a screwdriver to remove the grille. The only reason they don't get lost is because of Otto's uncanny ability to remember their route. However, they oddly don't have any difficulty removing the exit grille (and due to the exit's location, there was no way they could have checked it beforehand). There's also no excuse for the lack of security cameras in the air vents, given they're big enough to crawl through.
  • The Boy Who Knew Too Much by Roderic Jeffries. A youth breaks into an abandoned factory on a bet and finds himself pursued by masked thugs. The detective assigned to the case is reluctant to believe him, but then sees the marks where the kid dived down a chute and notes that he must have been pretty scared to have jumped in there without knowing where it came out.
  • Subverted in The Many Lives Of Stephen Leeds. Ngozi proposes this as a way of getting into a building with security cameras — because she's seen it on TV — but J.C., who is a military expert (sort of), lists several reasons why it's impossible. They do find a creative use for an air vent, but it only involves hiding a mobile phone inside.
  • In the first sequel to Little Fuzzy some would-be jewel thieves teach (and coerce) some "Fuzzies" (little furry aliens native to the colonial planet Zarathustra) into crawling through a ventilation system to steal some fabulously valuable gems. Justified in that an adult "Fuzzy" is only about two feet tall.
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