They're putting tubes through
the VENTILATION pipes.
Money Heist Season 3, Episode 6
or, if it went wrong, two dead bodies
inside the VENTILATION ducts."
Money Heist Season 1, Episode 6
It’s the VENTILATION nozzle.
Money Heist Season 1, Episode 5
Pressure. I've turned the VENTILATION up
to keep the outside out.
Breaking Bad Season 3, Episode 10
even in the underground VENTILATION ducts.
Money Heist Season 1, Episode 11