i really hate how so often in games and movies vents are portrayed to be big enough for people to crawl in, let alone support the weight of a full human being with maybe 10-20 pounds of gear
like what the forget its just there to hold air its not like they really put in strong supports or anything to support the weight of a person
maybe for a really big building but still, it doesnt make any sense. also for vents to lead directly into elevator shafts over thin air, like how the forget would you service those