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Appendix B
FILTERS
An independent certification agency or a qualified technician specializing in the repair and testing of
this type of equipment must perform all maintenance to the BENCHTOP BIOFLOW CHAMBER,
especially the filters.
I. Certification and Repair
All models of BENCHTOP BIOFLOW CHAMBERS have a large supply and a smaller, exhaust
HEPA filter. These are sized to provide the entire work area with ultra clean air and to filter
particulate matter. Approximately 30% of the circulated air is exhausted during each cycle. HEPA
filters are placed and sealed within the cabinet to prevent any bypass of air. Filters are certified to be
99.99 % effective against 0. 3 micron sized particles and free of any leaks discernible by this method.
In the majority of instances, filters received from the manufacturer are free of leaks. Those that are
not are repaired and retested. Testing also includes making sure that the junctions of the filter
medium and framework must be completely free of leaks. This testing also includes checking the
seal around the filter itself. Should damage occur to the filters or if after replacement, defects are
found in new filters, these defects can be repaired. This requires sealing with such materials as RTV
(Room Temperature Vulcanizing) silicone or preferably Elmer’s glue (commercial white glue).
Commercial organizations with proper equipment and personnel are available in most areas of the
world for testing and servicing. If, you need us to refer you to one of these agencies please contact
the factory.
II. Changing Filter on Benchtop Bioflow Chambers
A. Removal
1) Remove from shipping carton and examine for possible damage.
2) Remove the screws around the cover located on the top.
3) Remove top.
4) Remove exterior collar on top of exhaust (smaller) filter.
5) Remove exhaust filter and place in large bag for incineration.
6) Unplug or disconnect wires from the motor.
7) Remove all four nuts and hold-down bars from top of aluminum plenum
housing.
8) Lift out motor and plenum together.
9) Lift out supply filter and bag for incineration.
B. Installation Supply Filter
1) Remove from shipping carton and examine for possible damage.
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