How do negative pressure rooms work?

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How do negative pressure rooms work?

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ELI13 – the air pressure inside the room is lower than the outside. When the door to the outside is opened, the air outside flows in instead of the other way around.

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.