Labconco XPert Weigh Boxes 5220331 - Manual (Page 7)

Chapter 2: Prerequisites
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Support, Vibration and Preventive Requirements
In the preparation of a glove box site, please consider the following:
• A bench or stand that is rigidly mounted to the floor or fixed to the wall,
but not both, may be appropriate. 35" to 40" (889mm-1016mm) is
typical for standing height. (Labconco stands offered in Chapter 7 vary
in height from 33" to 40".)
• The corners of a building typically have less vibration than the center,
which promotes analytical balance stability.
• The bench typically should not contain any vibration-producing
equipment, such as shakers or pumps.
• A marble slab with dampening pads placed within the enclosure is an
effective low cost means of controlling vibration and one is included
with the XPert Weigh Box.
Location Requirements
The XPert Weigh Boxes have been designed to rest on a typical 29"-30"
(737mm-762mm) deep work surface. The height should be 35"-40" for
standing position. Avoid placing the glove box in high traffic areas where
walking might disrupt the operator or experimentation.
Exhaust and Blower Requirements
The XPert Weigh Box, as manufactured, uses an integral motorized impeller
to pull room air through the inlet and exhaust HEPA filters and discharge the
clean air back into the laboratory. This negative pressure operation mode
pulls all internally-contaminated air through the exhaust HEPA filter. The
HEPA-filtered exhaust air is then forced out the top of the glove box. An
optional FilterMate™ Portable Exhauster with a carbon filter may be
installed downstream of the exhaust to adsorb low levels of organic fumes,
formaldehyde, or ammonia gases.
The HEPA-filtered exhaust air from the glove box can be exhausted to the
outside with the installation of a thimble exhaust connection kit and remote
blower listed in Chapter 7. As an option, if necessary, the built-in motorized
impeller can be wall mounted.
Labconco does not recommend a hard duct connection using the built-in
motorized impeller as the source of airflow out of the facility. This
creates a positive pressure in the exhaust duct.