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I know a lot about airplanes, but I've always wondered the vents deal with air pressure in the sky

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marked as duplicate by reirab, Simon, fooot, Jan Hudec, Farhan Aug 6 '15 at 20:44

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  • $\begingroup$ The answers to this question explain that in quite a bit of detail. $\endgroup$ – reirab Aug 6 '15 at 20:23
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Came across this diagram that sums it up pretty nicely:

enter image description here

  • You get 'bleed' air from the engine compressor stage. On 'bleedless' aircraft, such as the B787, this is done by electric compressors instead.

  • Air temperature and pressure is adjusted as necessary in the conditioning packs since it heated up a lot when it was compressed.

  • Air is then distributed to the different 'zones'. A bit of the cabin air is recirculated.

  • Some areas, such as the cockpit, generally receive air directly from the packs without recirculating at a slightly higher pressure, to blow possible smoke away from the interior and to prevent smoke being recirculated into the cockpit. For the same reason, you try create a flow out through the baggage hold.

Here is a more complicated diagram from avsoft's website for a CRJ200:

crj200

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