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Chapter 3: Getting Started
individual ratings). For “field use” ASHRAE testing contact
Labconco for a certified on-site contractor. For particulate powder
validation, Labconco had containment testing performed to
validate the enclosures for sodium naproxen powders. The XPert
HEPA filtered enclosures demonstrated excellent containment
when used by an operator using excellent technique and good
containment when used by an operator using marginal technique.
While no enclosure can compensate for improper technique, these
tests confirm that the XPert HEPA Filtered Enclosures provide a
safe working environment. Labconco also performed extensive
ASHRAE testing to validate the enclosures for gas containment.
For copies of these validation reports, contact Labconco Customer
Service.
The XPert enclosures were also subjected to Biological
Containment testing, using a modified Personnel Protection Test,
as described in NSF/ANSI Standard Number 49. An aerosol
challenge of approximately 5 x 10
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spores of Bacillus subtilus var
Niger were released in the enclosure and appropriate air sampling
equipment established the number of spores that escaped through
the sash opening. Each size enclosure was tested three times. All
three sizes of the enclosure were tested at 75 FPM inflow and
typically 1 or less than one spore escaped from the enclosure
during each of the tests.
NOTE: Face velocity profiles and smoke testing
should be performed frequently per your
organization’s quality system to ensure safe
performance.
Sealing the Filtered Enclosure to
the Work Surface
When the filtered enclosure has been set in place, ducted, (if
necessary), and wired, it may be sealed at the work surface to
prevent spilled materials from collecting under the walls. A bead
of silicone sealant is recommended to seal the filtered enclosure to
the work surface.
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