That's called negative pressure. Some negative pressure is fine but some say too much can be bad.
@Mr. Grow It how can I tell if it's too much negative pressure? If that is possible
@Jonathan Greene Good question. I don't even know the answer to that haha; I've just heard of people complaining about too much negative pressure. It's not something I've personally run into. Maybe someone else here can chime in.
@Mr. Grow It thanks man.