9
performed at least annually, and many regulatory bodies recommend semi-annually. The following
chart represents the acceptable range of air velocities that are measured in your unit.
UNIT INFLOW DOWNFLOW VOLUME EXHAUST
FLOW
(fpm) (fpm) (cfm) (fpm)
BBF 2 87-102 65-80 106-125 174-204
BBF 3 102-112 67-82 116-146 132-145
BBF 4 102-112 67-82 173-211 136-150
BBF 6 102-112 70-85 292-344 108-118
Eventually the HEPA filters will be loaded with particulates to a point where the blower can no
longer overcome the resistance to provide the proper air velocities. At this point New HEPA
filters must be installed. Replacement HEPA filters can be ordered ahead of time so that they are
available in advance of changing. Because viable particles may be trapped and survive for a period
of time in the filters, the BENCHTOP BIOFLOW CHAMBER must be decontaminated, if any
biological agents have been manipulated within the cabinet, before any HEPA filters are changed.
Appendix A describes in detail how to accomplish this safety measure and Appendix B describes
the method of changing filters. Please call the factory if you need assistance, or a combined service
may be available from your certification company for decontamination, filter change and
recertification for a standard fee.
To Next Page
Loading...
