Labconco Protecto Downdraft Powder Station 3410025 - Manual (Page 12)

Chapter 4: Performance Features and Safety Precautions
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Directional Airflow
Directional airflow plays a critical role in Downdraft Powder Station
performance. Air is drawn through the perforated work surface and the filter
cover, on the front of the unit. The air then flows through the prefilter,
located behind the filter cover, and then the HEPA filter. The filtered air is
then exhausted out of the top left rear side of the filter module. This is
illustrated in Figure 4-1.
Prefilter
The prefilter is a disposable, pleated paper filter. The filter has a Minimum
Efficiency Reporting Value (MERV) of 8, meaning it removes 70-85% of
particles 3.0-10 microns in size. See Appendix A for reorder part numbers.
HEPA Filter
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 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.
Figure 4-1