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Labconco highly recommends installing an air-tight damper above each biosafety
cabinet when connected to a building exhaust system. See Air-Tight Damper
information on the following page. The air-tight damper allows for fine adjustment of the
exhaust air volume provided, in order to correctly set the necessary exhaust airflow for
each biosafety cabinet. It also the biosafety cabinet to be sealed off from the building
exhaust system, should it become necessary to do so.
The Inlet Relief Valve located on the top of the
cabinet is designed to draw a maximum of 100
CFM (170 m
3
/hr).
Attempting to draw additional room air through
the valve (room air exhaust), can result in
unstable cabinet operation. See Figure 2-4.
If additional room exhaust needs to be drawn
through the exhaust system, install an additional
duct and balancing damper downstream of the
cabinet’s damper. This will allow for proper
balancing of the system. See Figure 2-5.
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