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ページを印刷するTesting the system
General discussion
The Safe Cell is only one component of a space protected from airborne pathogens. Others include
proper sealing of the space and the release of overpressure in a metered amount. Your protected
space should be envisioned as a pressurized vessel with a calibrated release valve. The overpressure
ensures that all air enters only through the filtration system and the output ensures that you have
true ventilation that introduces oxygen that the occupants need to inhale and removes the carbon
dioxide that the occupants exhale. If you have a well sealed protected space, we recommend that
you install one of our overpressure relief valves to meter the outflow of air in a known, calibrated
quantity. See Section J for more information about the overpressure relief valve.
Test number one: the negative pressure test
The purpose of this test is to insure that all unprotected rooms and space that surround the
protected space are in fact at a lower air pressure than the actual protected space.
To conduct this test simply place - in a safe manner - lighted scented punks in the surrounding
unprotected rooms for a period of 5 to 10 minutes while the Safe Cell is in operation. No scent
should be detected in the protected space.
Test number two: the positive pressure test
The purpose of this test is to insure that all of the air in the room is escaping outwards through the
cracks around the doors and windows.
To conduct this test, shadow the cracks around the doors and windows with a lighted smoke punk
and observe the direction of the smoke draw:
Smoke drawn outward through a crack indicates the venting of positive pressured air from the
protected space. This condition is allowable and indicates that the system is working properly.
Smoke rising off the smoke punk and is neither drawn out through the crack or blown back
into the protected space. This condition is allowable and indicates that the crack is sealed.
Smoke blows back into the protected space from the crack. This condition is unallowable and
indicates insufficient overpressure in the protected space. This indicates that the system is
improperly installed or that the room requires additional sealing.
ASR-200-AV-NBC Safe Cell
Installation and Operation Manual
Revision C - April 27, 2016
Section
H
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