Labconco XPert Nano Enclosures 38876 Series - Manual (Page 24)

Chapter 4: Performance Features and Safety Precautions
Product Service 1-800-522-7658 19
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.
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. The rear perforated baffle may be tilted or removed
for ease in cleaning.
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.
6. Safety Glass Sash 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. The 5' and 6' units utilize a gas spring
assist in place of the latch.
7. Utility Ports allow electrical cords and data cords to pass through the back
of enclosure without leaving a large hole for contaminants to escape.
8. Accessory Guardian Airflow Monitor or Guardian™ 1000 Digital
Airflow Monitor continuously monitors airflow. An audio/visual alarm
alerts the user to low airflow conditions. The Guardian 1000 Digital
Airflow Monitor also displays a face velocity value, provides an RS232
output, a night setback mode and several auxiliary relay ports.
9. Inherently Safe Plenum 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.
10. Vibration-Isolated Motorized Impeller has vibration isolation supports,
which eliminates transfer of vibration to the work surface. The impeller
wheel is also dynamically balanced.
11. Speed Control regulates the speed of the motorized impeller and is used
by the certifier to adjust the inflow velocity. Located behind the front
panel.
12. Fluorescent Lamp is located above the work area, out of contact with
contaminated air. A safety glass window beneath the lamp distributes the
light evenly across the work surface.
13. Filter System Pressure Gauge indicates the total system pressure across
the filter and pressurized plenum to help predict filter loading.
14. Filter Clamping Bolt evenly seals the filter to the frame of the enclosure.