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 sash interior with clean air and reduces
powders 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 to ensure maximum
containment. Additionally, the upper dilution air supply reduces stagnant
pockets of air in the upper interior. See Figure 4-4.
4.
Zoned Rear Perforated Baffle
directs horizontal laminar air streams to
the three-zoned sections of the perforated baffle in a single pass. The
three-zoned sections have increasingly more airflow at the bottom that
helps form the laminar airflow. This smooth horizontal flow minimizes the
potential for air to roll forward preventing contamination from moving
toward the sash opening. The concentrations of materials are largely
removed on the first pass through the contaminated chamber. The zoned
rear perforated baffle may be removed or tilted down for cleaning. See
Figure 4-5.
Figure 4-4
