Originally Posted by brassai
Ya know..... I probably shouldn't say this simply because I don't have the time or inclination to completely back it up with the references.... but it's painfully obvious that the person who wrote that article has no clue of how aircraft pressurization systems work.
That's what I was thinking. I'll be the first to admit that I
don't know how aircraft pressurization systems work, but I do know that in my car when I switch to outside air from recirculated air the noise gets
softer. The recirulated air is actually louder.