Labconco Class I Enclosure Models 3980423 - Manual (Page 22)

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High Performance Features
The patented
1 Purifier HEPA Filtered Enclosure and Purifier Class I Enclosure are
designed to meet the needs of the laboratory scientist, and provide superior
containment while operating at velocities between 75-105 feet per minute. The
filtered enclosures have been tested to effectively contain toxic, noxious, and
biohazardous materials when properly installed and operated. What makes the
filtered enclosures so unique is the revolutionary way they direct air into and
through the contaminated air chamber. Labconco engineered the filtered
enclosures to minimize the effects of turbulence. The containment-enhancing and
aerodynamic designs of the upper sash foil, side air foils, lower air foil, upper
dilution air supply, and rear perforated baffle all work in concert to produce
horizontal airflow patterns that significantly reduce powder, chemical and
biological material concentrations through the work area.
These concentrations of materials are predominantly removed on the “first pass” of
airflow through the chamber resulting in high performance containment. The
plenum and the HEPA filter are jacketed by negative pressure. Should a leak
occur in the filter gasket or the plenum, the contaminated air is recaptured and
refiltered.
The Purifier Class I Enclosure and Purifier HEPA Filtered Enclosure have an
access port located behind the front panel. For HEPA filter removal in
biohazardous applications on Purifier enclosures, the HEPA filter will require
decontamination before removal. Users of all equipment are encouraged to
routinely check airflow or purchase a model with an airflow monitor.
1 U.S. Patent No. 6,461,233