Chapter 4: Performance Features and Safety Precautions
Directional Airflow
Directional airflow plays a critical role in evidence drying cabinet
performance. Air is drawn into the inlet prefilter, located on the bottom of the
door. The filtered air then flows upward through the liner, passing over the
evidence to be dried. Before leaving the liner, the air then passes through the
exhaust prefilter, that is designed to protect the HEPA filter from large
particulates, and may be removed to examine it for the collection of evidence.
The air is pressurized by the blower, and then forced through the HEPA and
carbon filters, to remove biohazardous particulates and odorous chemicals,
respectively. This is illustrated in Figure 4-1.
Figure 4-1
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