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After passing through the packs and turbines, where does the air get into the cabin? On the 737-800, for example. I don't see on the roof any grill to let the air enter the cabin, look: enter image description here

Source: Airliners.net

Where does the air enter the cabin? According this graphic, the air enters through the roof and exits through the wall: enter image description here

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  • $\begingroup$ check the floor, that's where the packs are. $\endgroup$ – ratchet freak Mar 12 '16 at 23:49
  • $\begingroup$ @ratchetfreak You mean the grills on the wall? I asked a question about those and their purpose is cabin air circulation $\endgroup$ – kepler22b Mar 12 '16 at 23:55
  • $\begingroup$ "Circulation", ergo where cabin air enters and/or exits $\endgroup$ – ratchet freak Mar 13 '16 at 0:25
  • $\begingroup$ @kepler22b They said it was for pressure balancing between the cargo compartment and the passenger compartment. There are those ceiling nozzles above the seat that the air comes in at the least. $\endgroup$ – SMS von der Tann Mar 13 '16 at 0:36
  • $\begingroup$ @ratchetfreak I'll put a picture to show that the air enters the cabin on the roof and exits through the grills on the wall :) $\endgroup$ – kepler22b Mar 13 '16 at 0:36
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It looks to me in your top image that the air vent is right there at the center of the ceiling.

enter image description here

It looks like a linear slot diffuser running the length of the cabin. Similar to this enter image description here

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