American Safe Room ASR-200-AV-NBC Safe Cell Manual de instalación y funcionamiento - Página 10

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How the Safe Cell works

The Safe Cell draws unfiltered air from outside and pumps it into the protected space as filtered air
causing a slight difference in pressure between the protected space and the outside. This increase in
pressure inside the protected space is known as overpressure.
This overpressure in the protected space dictates that all airflow is outward, not allowing
contaminated air or toxins to bypass the Safe Cell and migrate into the protected space through
small cracks or around doors and windows.
We recommend that the protected space have a minimum overpressure of .02 inches of water
column and a maximum not exceeding .06 inches of water column.
The following text regarding overpressure is taken from the U.S. Army Corps of Engineers document
Design of Collective Protection Shelters to Resist Chemical, Biological and Radiological (CBR) Agents,
# ETL 1110-3-498.
Definitions:
Toxic free area (TFA) same as meaning as Protected space or Safe Room.
Chemical, Biological and Radiological (CBR) same meaning as Nuclear, Biological and Nuclear
(NBC).
D-5. Toxic-Free Area Overpressure.
For existing facilities being modified or new facilities being designed with a Class II CP
system, the air intakes will be protected with a CBR filtration system.
The TFA will be designed for a minimum overpressure goal of 5 Pa (0.02 inches wg).
This overpressure corresponds to a wind speed impact pressure normal to a wall of 12 km/hr
(7 mph).
This wind speed condition is most favorable for directing a plume of agent with minimum
dispersion toward an outside air intake.
ASR-200-AV-NBC Safe Cell
Installation and Operation Manual
Revision C - April 27, 2016
Section
G
Page 10