Labconco Protecto Series Evidence Drying Cabinets 3390001 - Manual (Page 14)

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
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.