Chapter 4: Performance Features and Safety Precautions
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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
Room Air
HEPA-filtered Air
Contaminated Air
