Labconco Purifie Horizontal Clean Benches 38185 Series, 8' User Manual
Page 19
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Original Instructions
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All clean benches operate using the following principles:
• Filtration and retention of particulates by High Efficiency Particulate Air
(HEPA) filter(s)
• Laminar airflow
The major components in a clean bench are:
• The HEPA filter
• The motor/blower to force air through the unit
• A speed control for the motor
HEPA Filters
HEPA filters are disposable, dry-type particulate filters. The filter material or media
is typically made of borosilicate microfibers that are made 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 aluminum diffusers or by beads of
glue that add rigidity to the media pack. The media pack is then set into a suitable
frame, and the perimeter sealed to the filter frame, as shown in Figure 4-1.
The HEPA filter media is very fragile. Do not touch or contact
the media surface. If you think the surface of a HEPA filter is
damaged, DO NOT USE THE BENCH. Have the HEPA filter
integrity tested by a qualified certifier before using the cabinet.
!