Centers for Disease Control and Prevention 1600 Clifton Rd. Atlanta, GA 30329, USA
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Airborne Infections Isolation (AII) Room
TB AII rooms are designed to prevent the spread of droplet nuclei
expelled by a patient with TB disease. AII rooms have the following
AII rooms have negative pressure relative to other parts of the
Negative pressure causes air to flow from the corridors into the
Air cannot escape to the other parts of the facility when the door
is closed and the ventilation system is operating properly.
Air from AII room can be exhausted directly to the outdoors,
where the droplet nuclei will be diluted in the outdoor air, or
passed through a special high efficiency air (HEPA) filter that
removes most (99.97%) of the droplet nuclei before it is returned
to the general circulation.