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7: Exhaust System Connections
Not all models of biosafety cabinets are connected to a remote or building exhaust
system. Type A2 models may recirculate their exhaust back to the laboratory, or
remove their exhaust air from the lab via a Ventus
TM
Canopy (also referred to as a
Thimble Connection) connected to a remote (building) exhaust system. Type B2
models must always be connected to an exhaust system. Type C1 models may operate
in A-mode where the exhaust is recirculated to the laboratory, or B-mode when
connected to a remote exhaust system.
This section provides recommended best practices when connecting a biosafety cabinet
to a remote exhaust system to avoid operational problems with the cabinet. In addition,
the specific exhaust volumes and vacuum pressures required to properly operate each
cabinet model are listed by cabinet width and sash operating height.
If a biosafety cabinet is being altered from recirculating operation to ducted (exhausted)
operation in the field, it must be recertified by a qualified certifier before being used.
Exhaust Connection Best Practices
Note: Only connect the biosafety cabinet to a suitable exhaust system that is dedicated
to the biosafety cabinet, or dedicated to exhausting laboratory ventilation equipment.
Do NOT connect the biosafety cabinet to the building’s general HVAC system for room
exhaust.
Examine the location to ensure that it
accommodates the cabinet’s exhaust duct. The
area directly above the cabinet’s exhaust port
should be clear of structural elements, water and
utility lines, or other fixed obstructions. There
should be enough clearance to accommodate a
10-inch diameter duct. See Figure 7-1.
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