Labconco 3940200 User Manual - page 33

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Chapter 4: High Performance Features and Safety 

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 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