Labconco Biological Safety Cabinets 34610 Series - Manual (Page 25)

Chapter 4: Performance Features and Safety Precautions
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The HEPA filter manufacturer establishes the efficiency of the filter by
challenging it with an aerosol of known particle size. The number of particles
that penetrate the filter are quantified, and this establishes the efficiency of
the filter. Thus, the filters used in the Purifier Cell logic Biosafety Cabinets
are at least 99.99% efficient in removing particles 0.3 micron.
Note: The HEPA filter media is very fragile. DO NOT touch the media. If
you think the media of a HEPA filter is damaged, DO NOT USE THE
CABINET. Have the HEPA filter integrity tested by a certifier before using
the cabinet.
Note: HEPA Filters are only effective against particulate material. Gases
will pass through the filter.
Filter frame
Polyurethane seal
Between media pack
and filter frame
Filter media pack –
A continuous sheet
of filter media
ULPA Filters
Optional ULPA filters may be used to replace the standard HEPA filters in
the Purifier Cell Logic Biosafety Cabinets. ULPA filters have the same
properties as described above except they are rated at least 99.999% efficient
in removing particles 0.1-0.2 or 0.2-0.3 micron.
Figure 4-1