I did a 2 bedroom, hallway & small bath flood in which we floated the carpet. We only used the VapairVent and the photo of the bathroom above is the job. Dried completely without the use of a dehumidifier.
I would say it would not work for neg air containment situations. Definitely not.
You can use it for ducting from an a/c vent to the
Phoenix Solution. I have a Servpro in Florida that does this and he says it works very well.
The main thing about venting out of an exhaust fan in bathroom or laundry is to make sure the the exhaust ducts out of the building. Some older homes did not require this if a window was in the room. Good to check first or you may be dumping moist air into the attic. I have not come accross this yet, however, it is something to be aware of.