Is there an analog to "electrically isolated" but related to pressure (or more specifically, air pressure) instead of electricity? Perhaps "pneumatically isolated"? I don't think "hermetically isolated" has the proper meaning. I also considered "manometrically isolated", but I think that seems to refer too much to manometry. I just want to express that two different rooms are not isolated from each other in terms of air pressure.
Perhaps "piezo-isolated"? I can't find any precedence for this specific phrase, but it seems to express the correct meaning.