Labconco Total Exhaust Biological Safety Cabinets 30368 Series - Manual (Page 17)

Chapter 3: Getting Started
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Original instructions
Exhaust System Requirements
The cabinet exhaust stack is sized to accept 10-inch (254 mm) stainless steel
ductwork. The exhaust system’s blower should be sized to handle the
exhaust volume of each cabinet, as shown in the QuickCharts, Appendix E.
The exhaust system must maintain a static pressure equal to or greater than
the system pressure, plus 1.5 inches (38 mm) of water for the Logic cabinet.
In order to get the maximum life out of the cabinet’s exhaust filter, the
system needs to be able to operate at an additional 2.0 inches (51 mm) of
vacuum, compared to the initial total system pressure.
NOTE: The exhaust system should be fitted with a backdraft damper
(Part #3858800) to prevent the reversing of airflow in the system.
LABCONCO MANUFACTURES EXHAUST BLOWERS AND A
BACKDRAFT DAMPER, WHICH ARE SUITABLE FOR MOST SINGLE
CABINET INSTALLATIONS. THE REMOTE BLOWER IS DISCUSSED
FURTHER IN APPENDIX D.