Labconco Protector Demonstration Hoods 3945021 - Manual (Page 21)

Chapter 4: High Performance Features and Safety Precautions
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1. Aerodynamic Clean-Sweep™ Air Foil has a unique low profile
shape that allows air to sweep the work surface for maximum
containment. The Clean-Sweep™ openings create a constant
protective barrier from contaminants. In addition, should the operator
inadvertently block the airflow entering the air foil, air continues to
pass under the air foil and through the Clean-Sweep openings. See
Figure 4-2.
2. Containment-Enhancing Upper Sash Foil includes a perforated air
passage directly atop the sash foil to bleed air into the hood chamber
and direct chemical and powder concentrations away from the sash
opening. The radiused sash foil sweeps airflow into the hood with
minimal turbulence. See Figure 4-3.
Figure 4-2
Figure 4-3