Labconco Class I Enclosure Models 3980423 - Manual (Page 26)

Chapter 4: High Performance Features and Safety Precautions
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3. Upper Dilution Air Supply provides bypass air from above the work area.
This feature constantly bathes the inside of the sash with clean air and
reduces powders, particulate materials and chemical fumes along the sash
plane, near the critical breathing zone. Five to seven percent of the
required air volume is introduced through the upper dilution air supply.
The upper dilution air supply also reduces stagnant pockets of air in the
upper interior. See Figure 4-2.
4. Zoned Rear Perforated Baffle directs horizontal laminar air streams to
the three-zoned sections of the perforated baffle. The three-zoned sections
have increasingly more open area at the bottom that help form laminar
airflow. This minimizes the potential for air to roll forward preventing
contaminants from moving toward the sash opening. The majority of
contaminants are highly diluted, captured and removed on the first pass
through the enclosure. See Figures 4-1 and 4-2.
5. Side-Entry Air Foils allow turbulence-free air to enter the enclosure from
the sides and allow clean air to sweep the interior walls of the enclosure.
See Figures 4-1 and 4-2.
6. Ergonomic Slope of 10 degrees provides maximum visibility, and comfort
reduces glare, thereby minimizing operator fatigue. See Figure 4-1.
7. Internal Depth of 23" provides necessary depth to support modern
balances and other auxiliary equipment without extending outside the
enclosure or resting on the lower air foil. See Figure 4-1
8. Safety Glass Sash with Spring-Loaded Latch has a wiping seal to
contain contaminants and features a spring-loaded latch to secure sash open
for loading and cleaning. The sash must be down for normal operation.
See Figure 4-1.
9. Utility Ports with Iris allows electrical cords and data cords to pass
through the back of enclosure without leaving a large hole for contaminants
to escape. The enclosure ships with solid plugs. Iris plugs are included
with the User’s Manual. See Figure 4-1 and 4-2.
10. Accessory Guardian™ Airflow Monitor continuously monitors airflow.
An audio/visual alarm alerts the user to low airflow conditions. The
Guardian™ Airflow Monitor is an available option on all Purifier models.
See Figure 4-1 and 4-2.
11. Inherently Safe Impeller has a negative pressure plenum that surrounds
the positive pressure impeller so that if a leak should occur, the unfiltered
air is captured and refiltered. See Figure 4-2.
12. Vibration-Isolated Motorized Impeller has vibration isolation supports,
which eliminates transfer of vibration to the work surface. This is
extremely useful in weighing operations with precision balances. The
impeller wheel is also dynamically balanced. See Figure 4-2.
13. Speed Control regulates the speed of the motorized impeller and is used
by the certifier to validate and adjust the inflow velocity. Located behind
the front panel. See Figure 4-2.