They're putting tubes through
the VENTILATION pipes.
Money Heist Season 3, Episode 6
It’s the VENTILATION nozzle.
Money Heist Season 1, Episode 5
{\i1}The toilet's VENTILATION pipes{\i0}
Money Heist Season 3, Episode 6
even in the underground VENTILATION ducts.
Money Heist Season 1, Episode 11
Pressure. I've turned the VENTILATION up
to keep the outside out.
Breaking Bad Season 3, Episode 10