Chapter 4: Performance Features and Safety Precautions
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Blower
The blower assembly pulls room air into the intake prefilter on the front of the
door, through the liner and exhaust prefilter, and then forces it through the HEPA
and granular activated carbon filter. The evidence drying cabinet uses a motorized,
backward curved fan for quiet, energy efficient operation.
Cabinet Air Intake and Exhaust
In order to operate properly, the air intake at the bottom of the door, the exhaust
prefilter area in the top of the liner, and the top surface of the activated carbon
filter must be unobstructed. Blocking or restricting any of these areas, or allowing
the prefilters to become excessively loaded with dust can adversely affect the
performance of the cabinet.
Ultraviolet (UV) Lamp
(Model # 34000-00 thru -04, 34040-00 thru -04
& 34050-00 thru -04 only)
The optional UV lamp generates a primary wavelength of light of 254nm. A
secondary emission is in the visible (blue) wavelength, resulting in the
characteristic blue color while operating. UV light with a wavelength of 254 nm is
biocidal, primarily by creating thymine dimers in DNA. These dimers prevent the
correct transcription of the DNA into RNA, resulting in cellular death or viral
inactivation. In order to be effective, the UV light must directly strike the nucleic
acid, and its effectiveness can be diminished or negated by dissolved proteins or
metals, or by other UV-opaque substances protecting the target nucleic acid.
Because of its limitations, UV light should be used as an adjunct to good surface
disinfection practices. In order to get optimum performance from the UV light, it
should be replaced after 6,000 hours of operation or less, and the exterior surface
of the lamp should be kept clean and free of dust.
Note:
UV irradiation is absorbed by the tempered safety glass of the door.
Independent research has shown that the level of UV irradiation on the outside of
the cabinet’s door is equal to background radiation levels.
Note:
The UV sensitivity of a target organism varies, depending on the UV output
of the lamp, the genus and species of the organism, the medium the agent is
suspended in, etc. Contact the Health and Safety Officer at your facility for UV
light use and recommendations.
