Earlier quoted context omitted.
It probably is. Door closed + extractor makes gaps have negative pressure, no way anything goes into the room.
Extractor, what I’d call a bathroom fan, fair that effectively stops airflow, I’ll go with “close enough to negative pressure for civvies that they fool themselves” (I.e. ain’t actual negative pressure like a cdc lab) A door stops airflow? No.
I mean, it literally does. Put something that smokes in a bathroom, open the window, close the door, and caulk the gaps. See how much smoke phases through the door.