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How Does Negative Pressure Ventilation Work?
negative pressure ventilation was the first to be developed and widely applied starting in the early 1900s, but isn't really in use anymore. Negative pressure ventilation works like this: You seal someone's body from the neck down or at the very least, leaving just their mouth and nose open into an enclosed airtight box. Then you suck out all the air from that space, creating negative pressure. This causes the chest cavity to expand with air, allowing your lungs to draw in that air. And then you would pump air back into the room so bringing the pressure back up and that would lead to exhalation.