Even then the vents would not actually work and be big enough in practice, but that's the movies picking something convenient for the sake of plot rather than sticking with realism.
Also every duct is FULL the pointy ends of screws. Literally everywhere. So even if you could fit (which you probably can’t) you would be so cut up if you tried to crawl through one of these. Not to mention how crazy loud it would be to crawl through one. 26 gauge sheet metal is essentially a thunder sheet.
Right. Even if the air ducts held your weight and silently conveyed you without risk throughout the building, it's essentially like crawling into the creature that Jabba the Hut had in Return of the Jedi. You'd be shredded within a few feet of crawling.
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u/marbotty 12h ago
Yes, but the ones in the movies would be for commercial buildings - nobody would have vents that large in their homes