Labconco Protecto Series Evidence Drying Cabinets 3400004 - Manual (Page 19)

Chapter 4: Performance Features and Safety Precautions
Product Service 1-800-522-7658 15
Optional Evidence Prefilters
Optional Evidence Prefilters can be fitted on the inside (cabinet side) of the
door prefilter (located on the front of the door) and cabinet prefilter (located
on the inside top of the liner). These thin prefilters are designed for single-
use, to be removed after the evidence has dried. After removal, the Evidence
Prefilters can be examined for trace evidence, or stored with the evidence in a
sealed bag for future reference. See Appendix A for reorder part numbers.
Prefilters
Both the door prefilter (located on the front of the door) and cabinet prefilter
(located on the inside top of the liner) are disposable, polyester particulate
filters. Both filters have a Minimum Efficiency Reporting Value (MERV) of
11, meaning they remove 65-79% of particles 1.0-3.0 microns in size, and
more than 85% of particles 3.0-10 microns in size. See Appendix A for
reorder part numbers.
HEPA Filters
HEPA filters are disposable, dry-type particulate filters. The filter material or
media is typically made of borosilicate microfibers formed into a thin sheet,
in a process similar to the production of paper. This sheet is folded, or pleated
to increase its surface area. The pleats are held in place by aluminum
diffusers or by beads of glue that add rigidity to the media pack. The pack is
then set into a frame, and sealed as shown in Figure 4-2.
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. The filters used in the evidence drying 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. Call Labconco’s Product Service Department at 1-800-522-7658
or 816-333-8811.
Note: HEPA Filters are only effective against particulate material. Gases
will pass through the filter.
Figure 4-2
Polyurethane seal
Between media pack
and filter frame
Filter frame
Filter media pack –
A continuous sheet
of filter media