TAB Journal Summer 2019 - 4

ROOM PRESSURIZATION
VS. DIRECTIONAL
AIRFLOW
Sean Green, TBE, CxA
Environmental Test & Balance Co.

R

oom pressurization is a vital component of infection
control in hospitals, containment in laboratories, and a
means for limiting the particulate levels in cleanroom

applications. The room pressure differential is only one
component to the overall design and functionality for spaces
that require a barrier using airflow. The focus of this article
relates to room pressure differential and how it differs from
directional airflow.

A negative pressure room - such as an infectious isolation
room - should have inward airflow from all connected rooms
and corridors. Ideally, the room will have a negative pressure
relationship to ceiling plenums and wall chases with no
inward airflow at these architectural locations. The primary
objective is to contain the organic airborne particulate that
could potentially be present within the room. So, in a "perfect
scenario," the room is negative to ALL spaces, with inward
airflow ONLY at the openings around the door.

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TAB Journal Summer 2019



TAB Journal Summer 2019

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TAB Journal Summer 2019 - Cover1
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TAB Journal Summer 2019 - Cover3
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