Labconco XPert Filtered Balance Stations 3962622 - Manual (Page 23)

Chapter 3: Getting Started
Product Service 1-800-522-7658 19
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. For particulate powder and gas containment,
Labconco performed extensive testing to validate the enclosures. For balance
stability, Labconco conducted tests with a built-in blower and without a marble
surface; test results were excellent at 78 fpm and 100 fpm, confirming no detectable
instability with the five decimal place balance. 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
8 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 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 must 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. This seal also provides additional rigidity.
!