3: Getting Started
17
Exhaust System Connections
The Purifier Logic Series Total Exhaust Biosafety Cabinets are a “Type B2
biosafety
cabinet,” meaning they direct their HEPA filtered exhaust air out of the
laboratory.
WARNING: The Logic Total Exhaust Biosafety Cabinet is designed to
be connected to an appropriate exhaust system. Without verified inflow
velocity, the cabinet may NOT contain hazardous particulate or gasses. Do
not attempt to operate it when it is not connected to an appropriate exhaust
system that has been inspected by a qualified certifier.
WARNING: Type B2 Biosafety Cabinets rely on external blowers
(usually on the roof of a building) to exhaust 100% of the air entering the
cabinet. If the building exhaust blower fails or is mistakenly turned OFF, the
cabinet will become pressurized, resulting in a flow from the work area into
the laboratory. It is imperative that the following be considered in a risk
assessment:
Justify the type of work is appropriate for the cabinet Type B2.
Exhaust system must be reliable, maintained, frequently inspected
and preferably redundant.
Exhaust termination must be distant from other building air intake
systems to prevent the reintrainment of volatile chemicals.
NOTE: THE EXHAUST BLOWER CANNOT RUN AT ITS NOMINAL FLOW RATE
WITH THE SASH COMPLETELY CLOSED. IF YOU CHOOSE TO CLOSE THE
SASH COMPLETELY TO USE THE UV LIGHT FOR SURFACE DISINFECTION,
THEN THE EXHAUST BLOWER MUST BE SHUT OFF, OR ITS FLOW RATE
REDUCED 90% OR MORE FOR PROPER OPERATION. THE LOGIC CONTROL
BOARD HAS DRY CONTACTS THAT CAN BE CONFIGURED TO SIGNAL THE
EXHAUST BLOWER TO TURN ON WHEN THE LOGIC BLOWER IS ON. FOR
FURTHER INFORMATION, CONTACT LABCONCO’S PRODUCT SERVICE
DEPARTMENT. AS AN ALTERNATIVE, A REMOTE ELECTRICAL SWITCH FOR
THE EXHAUST BLOWER CAN BE INSTALLED NEAR THE LOGIC.
THE EXHAUST CONNECTION IS A SEALED EXHAUST SYSTEM FROM THE
TOP OF THE CABINET TO THE REMOTE BLOWER. THE EXHAUST
SYSTEMS SHOULD BE DEDICATED TO A SINGLE CABINET. THE CABINET IS
EQUIPPED WITH AN EXHAUST FLOW ALARM, SUCH THAT AN ALARM
SOUNDS, AND THE CABINET BLOWER SHUTS OFF IN THE EVENT OF
INSUFFICIENT EXHAUST FLOW.
