Basic Documentation

Table Of Contents
Biological Laboratories
Siemens Industry, Inc. 69
Topic Requirement(s) Commentary
Ventilation
for Biosafety
Level 4, Suit
Laboratory
(Continued)
HEPA filtered exhaust air from a
Class II BSC can be safely re-circulated back
into the laboratory environment if the cabinet is tested and certified at least annually
and operated according to the manufacturer’s recommendations. Biological safety
cabinets can also be connected to the laboratory exhaust system by either a thimble
(canopy) connection or a direct (hard) connection. Provisions to assure proper safety
cabinet performance and air system operation must be verified.