How do negative pressure rooms work?
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While your AC or heat is running, close a bedrooms door. There will be a gap at the bottom of the door. You should feel air blowing out of the room through that gap. That is positive pressure.
In a negative pressure room, there’s something sucking air from the room and shunting it outside. You would not feel the air blowing out of the room through that door gap.
If a patient has an airborne spread illness like tuberculosis, they will be placed in a negative pressure room. If they were in a positive pressure room, airborne bacteria and virus would be blown into other parts of the building where it could infect other people. In a negative pressure room, those infectious agents are blown outside away from people.
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