Labconco Biological Safety Cabinets 34608 Series - Manual (Page 16)

Chapter 3: Getting Started
Product Service 1-800-522-7658 11
5. Tighten the tube fitting nut hand tight and then, using a 7/16-inch wrench,
tighten it at least ¾ turn more.
6. Close the service valve in the Biosafety Cabinet and then slowly open the
shutoff valve on the service valve. Test all fittings for leakage. Tighten
the tube nut slightly if needed.
Tube fitting nut
Tube fitting
Optional Exhaust System Connections
All Class II, Type A2 Biosafety Cabinets are shipped to recirculate their
HEPA filtered exhaust air back into the laboratory.
Certain applications such as working with odorous products or volatile toxic
materials will require the connection of the Biosafety Cabinet to an exhaust
system.
Note: The canopy connection, also referred to as a thimble or air gap
connection, allows single or multiple biohazard cabinets to be connected to
an exhaust system. During operation, the exhaust system draws all of the
cabinet’s exhaust air, plus a volume of room air (through the slots in the
canopy) into the exhaust duct. Canopy connections function as a “shock
absorber” allowing the system to function properly during changes in room
air pressure.
For information on selecting a canopy connection, go to Appendix D:
Accessories.
Warning: If the research involves the use of toxic compounds or volatile
materials, contact the facility’s safety officer or Labconco to ensure that the
Biosafety Cabinet and its exhaust system are compatible with the materials
you will be working with.
Figure 3-3