User blog comment:Miskos3/Fairy Tail Chapter 486: The Fourth Guest, Review/@comment-7418318-20160525151848/@comment-5894890-20160527170122

So, uh, just a quick sketch, (don't know if I need to fill out the FUR thing o_o), the iron lungs don't function as a filter; unless you can explain how?? I have other comments in my diagram. So in this case both oxygen and MBP would still enter the lungs.